Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c88c9932ad62241…

MALICIOUS

PDF

96.5 KB Created: 2021-03-10 18:45:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1dd7bbc5f1b6770ed2022b6af9eec09e SHA-1: e980138fceef21484925a69396ca1f570d5224b1 SHA-256: 4c88c9932ad6224159004b06fef55b446873bf218841b86e8aa891b52d3d78f5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely leading to a second-stage download or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9821

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gimoguvi.ru/strik?utm_term=opposite+meaning+of+dappled PDF link annotation
    • https://cdn.sqhk.co/xopuwomu/hdNsJja/technewztop_stylish_font_keyboard_for_android_app_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391907/normal_5fe3a01c74b6d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500887/normal_5ff97c4da47ca.pdfIn PDF document text
    • https://cdn.sqhk.co/patagarinixa/hgu12aj/64393412547.pdfIn PDF document text
    • http://the-job.ru/desarrollo_psicologico_a_traves_de_la_vidan2umx.pdfIn PDF document text
    • https://marulokovew.weebly.com/uploads/1/3/4/6/134611896/vexuxorujudekafus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470523/normal_5ffbf5ce32de1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379732/normal_60371bfa4f66a.pdfIn PDF document text
    • https://vowagogo.weebly.com/uploads/1/3/5/3/135307183/7797708.pdfIn PDF document text
    • http://meblik.su/44885388514qgs0p.pdfIn PDF document text
    • https://cdn.sqhk.co/korebuxaguz/ghhj09N/tepasosidoviril.pdfIn PDF document text
    • https://cdn.sqhk.co/lazemowul/JDVuiic/29798786170.pdfIn PDF document text
    • https://cdn.sqhk.co/waxipefimafa/haoShhH/posovopuloludunufulozi.pdfIn PDF document text
    • https://kuzosilu.weebly.com/uploads/1/3/2/8/132815793/zaxixubu-zoxifujagebaw-dezer.pdfIn PDF document text
    • https://fokifukamanur.weebly.com/uploads/1/3/0/8/130874497/1605875.pdfIn PDF document text
    • https://fivarebaxuru.weebly.com/uploads/1/3/5/3/135326201/2919245.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/afb4c115-03cf-42c9-89ff-93b4cea8a592/practice_english_conversation_online_skype.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/best_website_templates_for_authors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ba9a896-d6ee-4392-b919-9c4daf3ec794/padi_open_water_diver_course_cost_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/938b94d8-0bd1-4ea0-8773-577a2a0acb5a/guitar_songs_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bf1748f-bd06-42d3-a2bc-acde8bd6e3cc/pijixe.pdfIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/adm_er_pro_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92c8ee75-8188-4f11-abc8-df8e0a95fb25/nepunupabujamuratebal.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/format_bannire_facebook_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/pudaxarobus.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/mapamut.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off000157fa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x157FA 17552 bytes
SHA-256: db5f696d76d9e07b35d460a65aabc5b3ec3c7e368639b05671cac6bb75d56dcd
font_00_sfnt_off0000eb02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB02 3544 bytes
SHA-256: d9dd8bdc0529524a64fe9acc2001fc94e7af583934d37cf80e660f233b63d0cd
font_01_sfnt_off0000f7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B9 5292 bytes
SHA-256: f066d88f6090253d22e166912eaae2481ea0d1981f400432c694826842ef8cac
font_02_sfnt_off000109a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A4 2656 bytes
SHA-256: c206ac4eca120f096112d408dff6b33a2f721090936d80486df636e1cd240fde
font_03_sfnt_off000114aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AA 2328 bytes
SHA-256: 3702365b3034b9d7945da23b991b5e2ac3f8bb06d1ba3be7e5ba1b5d8dd48c9f
font_04_sfnt_off00011f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F61 2108 bytes
SHA-256: e66bd646ff29f48b94a898642357a1d5295b77faffa0bd70eb77acb4aebc9a97
font_05_sfnt_off00012938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12938 15240 bytes
SHA-256: 190456c68eccadcf69c7c0e5dcbc5feaf7581818c7d08d7c644857ca91f0e0a2

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