Malicious PDF — malware analysis report

Static analysis result for SHA-256 955dc7367141bbe3…

MALICIOUS

PDF

80.5 KB Created: 2021-06-03 13:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 56a2786fcf6d4d7cb8caedffde7a6f02 SHA-1: 74338abc1fa8ba9528c0b533439ce2db055fba95 SHA-256: 955dc7367141bbe36e0a679b453be6e6fc26ee03c728692daad07048ef338734
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 0.9990

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://pistant.ru/pbw?utm_term=x96+mini+android+tv+box+user+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4467975/normal_6014378eaacb9.pdfIn PDF document text
    • https://vudexugir.weebly.com/uploads/1/3/2/7/132710723/bccbe7a90211.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468838/normal_606dda9443204.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421782/normal_5fc79d794f652.pdfIn PDF document text
    • https://xapiwelawuk.weebly.com/uploads/1/3/5/3/135341488/3181571.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379720/normal_6030f898b6293.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473618/normal_6032547d82be0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488100/normal_6066f29eaff3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447276/normal_602d033959c04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500438/normal_601784767a8d2.pdfIn PDF document text
    • https://xogepojofaridel.weebly.com/uploads/1/3/2/7/132741214/64511ecc.pdfIn PDF document text
    • https://zosagejezigim.weebly.com/uploads/1/3/4/7/134709887/bugidijiparo.pdfIn PDF document text
    • https://bilezezewi.weebly.com/uploads/1/3/4/6/134626203/4961324.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://laxaxufudej.pbworks.com/f/67668409100.pdfIn PDF document text
    • http://jeselivid.pbworks.com/w/file/fetch/144490035/how_to_be_a_pnp_police.pdfIn PDF document text
    • http://ruwezebom.pbworks.com/w/file/fetch/144424962/6778898009.pdfIn PDF document text
    • http://kukepofarit.pbworks.com/w/file/fetch/144447072/14349976351.pdfIn PDF document text
    • http://sutodoromar.pbworks.com/f/tuzomuzixevul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b9d08bb-45d9-4565-ba3c-abf207539ff8/33250028034.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c962fe48-d198-413f-9cbe-1ab679128bd0/tixojaxorawazazefo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c7c24c0-fdaa-4f9e-a72f-bd8925232915/frp_bypass_samsung_a10e_no_pc.pdfIn PDF document text
    • http://rorazokazog.pbworks.com/w/file/fetch/144557460/how_to_connect_wireless_mouse_to_new_receiver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f6c387f-2208-49b5-822d-8a0de9b94745/norafejuvun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fcf5100-1801-4306-a9a2-d91f4835bd48/tajujireferumoralutuj.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_off0000f2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B0 5524 bytes
SHA-256: f3c74284358d7c6edc3843b6185e02f9c0b52ac417acc27dd5fc6f1ffec62953
font_01_sfnt_off0001054f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054F 1800 bytes
SHA-256: 6d2a3a16cc464ce72cf05976c7f96a31c93af2202e0dc760c37a694345e222ee
font_02_sfnt_off00010ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDF 11236 bytes
SHA-256: d6b325e439debe6a920f3465feb4960bd7642da78e28913e42ef43388c221f4d