Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5e8eef5ec8d8ecc…

MALICIOUS

PDF

78.2 KB Created: 2021-03-29 01:40:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 82f2b29412869d8067e240ebc5c02891 SHA-1: c07c1106edd4dacb76ea580cc909008a48cfb5e1 SHA-256: f5e8eef5ec8d8eccc5fd294356cf99af06772b930b4dcdb9ac6eaee9d687d991
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 external URIs, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=defensive+driver+post+test+answers PDF link annotation
    • http://winoorama.fun/fozarakomogenivorepalfv70g.pdfIn PDF document text
    • http://subbellassecret.com/an_inspector_calls_imdb_parents_guideqvxqd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476436/normal_6028ee763fe13.pdfIn PDF document text
    • http://claire-irk.ru/how_to_replace_a_whirlpool_refrigerator_filteru0t66.pdfIn PDF document text
    • http://zitokujamu.mypressonline.com/english_barakhadi_chart_download.pdfIn PDF document text
    • http://vuvajujuli.mygamesonline.org/50717984997.pdfIn PDF document text
    • http://begemot.space/22928408188kkfe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529281/normal_5fdad38d2b183.pdfIn PDF document text
    • http://lorenbayi.com/walmart_black_friday_2020_event_3fy7yv.pdfIn PDF document text
    • http://xofitazuregokud.mywebcommunity.org/ontologa_definicion.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423732/normal_603e161b441e1.pdfIn PDF document text
    • http://tekplafond.xyz/asus_rt-ac68u_firmware_restorelmy9x.pdfIn PDF document text
    • http://nukicew.xyz/zemepoligetanadeba8x4n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455183/normal_5fdec8eae4d19.pdfIn PDF document text
    • http://vvvvvvvvvvvvvvvvvvvvvb.xyz/piliwixamadigubsxebj.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/56755d4a-56d7-4450-ba58-b137b10a02a6/drawing_line_graphs_lesson_tes.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/jumijejigufoxapesabaxijo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3e9e740-a0cb-414f-abde-7135aece87a1/bosch_ascenta_series_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a405539-9fe7-4180-a79b-8709db6b446c/lilogewakerukazevixevo.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/how_do_you_attach_metal_to_wood_without_nails.pdfIn PDF document text
    • http://begujewirefe.myartsonline.com/bisexuality_in_the_ancient_world.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/60670800774.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E5 5156 bytes
SHA-256: 7129c810f0f51abe7af5520a7cf22465e1b6f3bc32e590131ddef5069e619eb2
font_01_sfnt_off0001059c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059C 11268 bytes
SHA-256: 58aac0ea18dbf2e57d0d06c91d8c50a354f637cb69d82e5f58903b9d5f5743a7

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