Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4ea44288a33f295…

MALICIOUS

PDF

103.6 KB Created: 2021-03-24 20:27:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 58fe799b4cefd6f07ab534a579c05e2e SHA-1: 588712bcba1880698d7421081dfbf1f8145445b9 SHA-256: e4ea44288a33f295a78193fa046a9f1e7922185509e069400025127b4cb96e04
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://vilenefex.ru/award?keyword=sudden+death+infant+syndrome+pdf PDF link annotation
    • https://cdn.sqhk.co/baxikomo/gShbhew/8831801430.pdfIn PDF document text
    • http://kelnoteres.xyz/483654718192cj0e.pdfIn PDF document text
    • https://lifefazat.weebly.com/uploads/1/3/4/7/134742259/bakokure_bijefi_zuliwixogev_sumivatiz.pdfIn PDF document text
    • https://cdn.sqhk.co/xosaletozobi/eZbRjfT/poison_frogs_leaf_litter_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/kalusoxat/2sijtlt/58945015469.pdfIn PDF document text
    • http://idealslimitalia-ufficiale.site/conjugating_reflexive_verbs_in_spanish_past_tenseub9wz.pdfIn PDF document text
    • https://divamokavagi.weebly.com/uploads/1/3/4/8/134871471/7507645.pdfIn PDF document text
    • http://negozio50sconto.info/what_is_strategic_management_process_with_examples179k.pdfIn PDF document text
    • https://cdn.sqhk.co/zokirafuka/4jajctr/background_photo_karna_hai.pdfIn PDF document text
    • https://cdn.sqhk.co/pakelabete/bhh5rie/93382334137.pdfIn PDF document text
    • https://lojizeli.weebly.com/uploads/1/3/3/9/133997115/luwodituromipikiji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3c3b6f52-20a2-448a-be11-eec5930c502f.filesusr.com/ugd/0ca786_6f8eff1bf18349c4b802d49f6009296b.pdf?index=trueIn PDF document text
    • https://26577e91-18e8-42c3-8e85-49dcca1d6605.filesusr.com/ugd/195787_27827e12965f4d99ac9d2a267396c8c6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c286ab14-57ba-4e08-90f8-24d9cb7f5454/how_long_does_post_acute_withdrawal_syndrome_last.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6991a8a5-02c4-4044-8913-805f7600b2a3/attack_on_titan_season_2_netflix_canada.pdfIn PDF document text
    • https://65f7c47b-6fa2-4aed-9649-637438a88329.filesusr.com/ugd/8fb471_7458f19c36f442fda2dd1c9721a07072.pdf?index=trueIn PDF document text
    • https://2703069b-a6ff-4ff9-983c-db139a8d76ba.filesusr.com/ugd/8b61cf_44d328fa6a6b44b5813da7fd0ad23e34.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/545d647e-4b63-4476-8820-c7ca264880c7/message_to_the_black_man_by_elijah_muhammad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4514fe6a-5481-4f4b-b18c-96f387f47b60/vavegenedubumumupomenotus.pdfIn PDF document text
    • https://ba85394b-11ac-4ca4-926b-74ca936c52e1.filesusr.com/ugd/5ccfc8_d0c89eb4a60e466ca9d12b4133fb46e0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b403fe9-85dc-477e-bb27-455f89da7297/is_inorganic_or_organic_chemistry_harder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/152ec58e-ab8f-4fa9-b74e-cf48dfb4df68/49496393320.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_off000157bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157BB 5452 bytes
SHA-256: 1d3c31c36f14e5126fb835adf3208946ea82d845800b4c9af1da591ce58a3467
font_01_sfnt_off00016a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A27 11652 bytes
SHA-256: 074a16bf975845ce599665888b2f7611329431183e70688871042ada2ce244fa