Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fcce7bae964f32a…

MALICIOUS

PDF

77.9 KB Created: 2021-03-16 08:32:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1d6c214fe3f8dc43c8a7e6e9d8992784 SHA-1: ef4039dd83b1c79a7d290ebdba3b42a530984727 SHA-256: 5fcce7bae964f32aeaa37a84291948d51ec2bd40d7e82cb8766cfb014bbe8379
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO abuse tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/123?utm_term=glencoe+health+chapter+5+test+answer+key PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368246/normal_5fefab3c7489e.pdfIn PDF document text
    • http://zipubezexupoka.mywebcommunity.org/tiwuzilafuxajenanaxuta.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487902/normal_5ff1962eb43ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496815/normal_602172fc2fc39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454546/normal_604680948fac0.pdfIn PDF document text
    • http://benivosefemiza.medianewsonline.com/93190195023.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453890/normal_604cd6ae87f76.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/d40d919f-026b-4652-930f-9ecf1b6c23db/24545623071.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b216be3-3937-48cf-9ac3-79fddd73cae8/sales_questions_to_ask_interviewer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51a1e199-2a08-49ec-8585-d983843a057f/how_to_scan_a_document_using_hp_officejet_4630.pdfIn PDF document text
    • https://973697ad-ffa4-4f9d-85cd-0c9d1ea039ee.filesusr.com/ugd/5f5755_0160ef5a0ced4c77ae5a3560f018eedd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/never_back_down_motivation_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/answer_to_a_subtraction_problem_sum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ada75d18-cb20-4d7d-a1db-345138ccd117/international_mail_manual_index_of_countries_and_localities.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33d3614e-cf68-4252-bae1-991d2f837791/78462775612.pdfIn PDF document text
    • https://50037ee0-0691-4a53-bdc2-b2f8f795cfa6.filesusr.com/ugd/b41a9a_dfd17757ccd64ff8ad0122953b284f68.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lumixi/double_cardan_joint.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_off0000e301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE301 5176 bytes
SHA-256: 7899f5c5380591426abd8b50df6e779a4b94436733b194cf9470cfc5b341eac2
font_01_sfnt_off0000f4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A3 11516 bytes
SHA-256: b3ebb249da3e446beda5fc3ac85c92b088d16b13db9adf96fc0d3ee3400d0265
font_02_sfnt_off00011aba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABA 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71