Malicious PDF — malware analysis report

Static analysis result for SHA-256 83b3ae8c4bfdb738…

MALICIOUS

PDF

75.5 KB Created: 2021-03-25 08:25:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: d8056cadef256a15a79b100b9564c2b2 SHA-1: 08f5142750a5402aeb5a5e51b87fc9b45162d7a1 SHA-256: 83b3ae8c4bfdb738ce09662fd0de119ba8f0fbeb62c0d89a158763d2e1718c44
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics, including ML and ClamAV, as malicious. It contains numerous embedded URLs, many of which point to disposable hosting or redirectors, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links on low-reputation domains, further supporting this assessment. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/123?utm_term=chungha+roller+coaster+song PDF link annotation
    • https://cdn.sqhk.co/lusimalifa/Mgh27MM/.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501208/normal_5fef50365a1df.pdfIn PDF document text
    • https://cdn.sqhk.co/sowotewope/hj4rWii/download_game_downhill_master_apk.pdfIn PDF document text
    • http://zivemigidefis.mypressonline.com/b._sc_nursing_2nd_year_syllabus.pdfIn PDF document text
    • http://worozoxiw.sportsontheweb.net/platero_y_yo_resumen_rincon_del_vago.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385887/normal_601af7491adbb.pdfIn PDF document text
    • http://zujewubowufonug.scienceontheweb.net/fit_for_life_food_list.pdfIn PDF document text
    • https://cdn.sqhk.co/bapulofuw/0jjjhNR/91161282815.pdfIn PDF document text
    • http://samemere.mygamesonline.org/wezimipeguxadaf.pdfIn PDF document text
    • http://penexej.mywebcommunity.org/26077783090.pdfIn PDF document text
    • https://cdn.sqhk.co/xelajuwodaf/eFgdwhh/all_information_about_gst_in_marathi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8127c790-c750-4a5b-a1b7-1a9148b990b2/how_to_set_temperature_of_haier_inverter_fridge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e12836a-09a4-45b2-905b-3025ea2dfed2/kenmore_progressive_vacuum_attachments.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2b7d84a-73b8-461b-bba7-485f19e15153/jvc_kw-xs68_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8713905c-29e6-49d7-ac6b-88625a157069/janox.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/1992_toyota_pickup_factory_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/3129405601.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8f909f0-ec9f-4bdd-9513-0508a647f09a/popirakiwupukasujez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46ee4aba-5461-4bb9-a7fe-7d795c064953/88106676098.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/297357b4-9f85-4f29-8c22-95fd06d05f34/rediscover_catholicism_by_matthew_kelly.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD665 5124 bytes
SHA-256: 10deceab328825916e85ce8ee89834d64f8f1ed6e53a341e509a7d88177e679f
font_01_sfnt_off0000e81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81A 4968 bytes
SHA-256: e2bdf506f93d2bd85af50780c9a8760c11a9771c9ae7be54f6b6b20102fe8098
font_02_sfnt_off0000f8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F4 12112 bytes
SHA-256: 46f028f8b744354b3884457fd6a489091d68736e7cc551a3718ce3014b78499a

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