Malicious PDF — malware analysis report

Static analysis result for SHA-256 312e65f1165a74ef…

MALICIOUS

PDF

77.3 KB Created: 2021-04-22 19:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 44874b3bda089198307c9b7e525dd9a1 SHA-1: 15fbebbf560d025d83eb6d1e51d13fa5b549e800 SHA-256: 312e65f1165a74ef92971ce3140dde17b8433b0b3feb9f49b9609c8104eb78dc
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 0.9993

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://pelibifir.ru/strik?utm_term=chandamama+kathalu+movie+audio+songs+download PDF link annotation
    • https://kewesolatuveg.weebly.com/uploads/1/3/1/4/131452958/48621.pdfIn PDF document text
    • https://fijisakotapabe.weebly.com/uploads/1/3/4/0/134013267/9187740e6.pdfIn PDF document text
    • https://resagivet.weebly.com/uploads/1/3/1/3/131383325/pewinigine.pdfIn PDF document text
    • https://pikupazu.weebly.com/uploads/1/3/4/5/134577858/937d94e1747.pdfIn PDF document text
    • http://rusefogotomik.iblogger.org/cancer_types_causes_and_treatment.pdfIn PDF document text
    • https://guvepilafofifiv.weebly.com/uploads/1/3/4/6/134682232/vadojatilapimisakiri.pdfIn PDF document text
    • https://nonuvatemex.weebly.com/uploads/1/3/4/4/134443968/vutat_kexivuruxula.pdfIn PDF document text
    • https://xibokesobapud.weebly.com/uploads/1/3/0/7/130776239/puremom_lusinediweb_dejogoraxamasa_korawunoni.pdfIn PDF document text
    • https://gonuvogizup.weebly.com/uploads/1/3/1/8/131857562/mawodibaxirugizipa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dudotofuzariw.rf.gd/31560396683.pdfIn PDF document text
    • https://e108c0fa-8e70-4110-aab7-e0d30777705f.filesusr.com/ugd/d9966b_62a1227f609843a681b1a50e6db3b75f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/daa36539-705c-4acb-b33b-7af8f7504f41/82669812770.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/297f52d3-5e27-49f1-b1d3-527ab4167408/17886096320.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/024a966c-b04c-4e8c-9a27-0cc82641aa83/vimixopatepige.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5b8fa22-d8bf-44b8-92db-c848a70699ea/91605589808.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3d3afed-cc52-4f24-ae38-812ace6316f3/wowukokifoputuziz.pdfIn PDF document text
    • https://db532842-334f-4efb-8993-e67ec8f20ff5.filesusr.com/ugd/bc5be3_8339d01901d34f11b62310cc6012bd4e.pdf?index=trueIn PDF document text
    • https://f3dcd8e3-6656-4b47-a81e-a993d3c4f2a1.filesusr.com/ugd/aa9ef2_a2c9feec29354a07a6429b7a0144a972.pdf?index=trueIn PDF document text
    • http://maxovizanopi.rf.gd/14143853012.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1a54f3c-6310-4c9a-88bb-6156c84b61cd/martial_power_meaning.pdfIn PDF document text
    • http://gasunerumep.rf.gd/are_taylor_weight_scales_accurate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e192094-f2b3-4711-80d6-2115ee2b3565/53180684393.pdfIn PDF document text
    • http://nogapovo.rf.gd/.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_off0000ec23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC23 5264 bytes
SHA-256: 06660a97c9a4b33a9233f51b2e1c55e6bd6655b1e2c1104d49ade0ad38f1d6fc
font_01_sfnt_off0000fdf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF5 12404 bytes
SHA-256: c85c57455a63b0d166afc48570461ac39171303ea9074dff897d213939a75723