Malicious PDF — malware analysis report

Static analysis result for SHA-256 8366f508ba95a9c9…

MALICIOUS

PDF

75.6 KB Created: 2021-04-11 13:34:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9d3382d977b5927d6bba68b764e00044 SHA-1: 9b183d0107e82608c96a21921eb4010b76cb2143 SHA-256: 8366f508ba95a9c935e2d89178adb33b5095d243b1b1702459eb4889b693af23
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9948

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://seumenha.ru/strik?utm_term=human+anatomy+martini+timmons+tallitsch PDF link annotation
    • https://cdn.sqhk.co/volinafi/egjjhjj/lufotomotuwufeginevesalet.pdfIn PDF document text
    • https://bafokaxaxex.weebly.com/uploads/1/3/4/8/134881351/jamaj.pdfIn PDF document text
    • http://raraveluwogevuw.mypressonline.com/72191307272.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449014/normal_5fe9e77f2001d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420434/normal_60579e9a51d79.pdfIn PDF document text
    • http://jinobuzid.scienceontheweb.net/aquelarre_ars_malefica.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzosexiwugu/Rzshhec/21765561410.pdfIn PDF document text
    • https://bugukafu.weebly.com/uploads/1/3/4/4/134490359/63938e5b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416938/normal_5fc92391d1fb5.pdfIn PDF document text
    • http://vetovikaxu.mypressonline.com/business_model_canvas.pdfIn PDF document text
    • http://lamaded.mywebcommunity.org/91460810065.pdfIn PDF document text
    • https://kalaxokesipak.weebly.com/uploads/1/3/4/8/134888683/xatazeja_jojipaw.pdfIn PDF document text
    • https://winalefumigis.weebly.com/uploads/1/3/1/4/131437210/2752686.pdfIn PDF document text
    • https://cdn.sqhk.co/lepemafe/djeheSn/space_engineers_update_1._196.pdfIn PDF document text
    • http://zekaxezixil.medianewsonline.com/grade_1_math_addition_word_problems.pdfIn PDF document text
    • https://kefagifugujog.weebly.com/uploads/1/3/0/8/130813645/kimoloxobiraf-nonokexopolo-tixubodi-juketogaxiferep.pdfIn PDF document text
    • https://cdn.sqhk.co/lopumilekana/3jejdUU/spacex_crew_dragon_return_to_earth_date.pdfIn PDF document text
    • https://cdn.sqhk.co/jotapepikota/vlZicgj/dental_assistant_jobs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411926/normal_600c7dbcf223a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459175/normal_603b9af37c765.pdfIn PDF document text
    • https://rowopubogapog.weebly.com/uploads/1/3/4/2/134234702/bogujakakomi-votasefafemezo.pdfIn PDF document text
    • https://zeleloda.weebly.com/uploads/1/3/0/7/130776222/sewunavi-ziwim.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/05210ed2-1d5b-4fa5-b616-ae1a137cce64/77256718444.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5bdf5be-4506-45b6-9c87-f56e0e3a204f/75582165123.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ce797be-c8f4-4869-b883-3b84c3419b5f/27971644346.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8c6e730-465d-4631-886f-651770a88ec2/el_espejo_enterrado_carlos_fuentes_documental.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d557b3c-ddb9-4f08-b51b-c1bf0cbfae25/kiremimemoxafokew.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_off0000dd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD61 4868 bytes
SHA-256: 22b2f26fa57d57aa0bf0a50d1097b87fa2a9a62fb51770bf9ee22206fe5f7a88
font_01_sfnt_off0000edaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAA 10840 bytes
SHA-256: 1e2b47c2779ae79b9c9698db2c229aecd3a95a291ef2945159d6eee0416d3526
font_02_sfnt_off00011293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11293 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3