Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cc38af22ad962ce…

MALICIOUS

PDF

72.8 KB Created: 2021-06-10 13:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 98cc7599c2bc0f0ef90ede49464dd7e4 SHA-1: 85be67f866cca515c28e99ea9605ee0557097490 SHA-256: 5cc38af22ad962ce9909a4f8f27ae55c63d4aed2f69fb501f25486d6118d1a72
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

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://philabc.ru/pbw?utm_term=senran+kagura+2+3ds+cia PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382201/normal_60be065b0a52d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379612/normal_5fd74d7e31fc6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467561/normal_6000217322bfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406775/normal_6041d45fb45b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466664/normal_603bcfd8276f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412757/normal_5fc875bc545ec.pdfIn PDF document text
    • https://tenusalawumuta.weebly.com/uploads/1/3/4/3/134332014/kufavuse.pdfIn PDF document text
    • https://fibadajemuda.weebly.com/uploads/1/3/2/3/132303382/zosinisogitiwe_fagepame_luwepa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370987/normal_600e9c5189ceb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417519/normal_6011045148a33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421783/normal_602ca9abf17a0.pdfIn PDF document text
    • https://wevuviwujito.weebly.com/uploads/1/3/1/6/131636984/durifudas.pdfIn PDF document text
    • https://ginamorevuj.weebly.com/uploads/1/3/4/3/134392530/9681823.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/7e517407-8d2f-4e7b-8599-edd80afe8237/buffalo_wzr-600dhp_repeater_mode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62e84b1a-2174-4f0d-b174-ebe28d4e4bde/what_is_the_importance_and_purpose_of_writing_a_business_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c0826f0-8be4-4190-8428-a1dc129c1584/20054823642.pdfIn PDF document text
    • http://mumasenekera.pbworks.com/f/flipaclip_unlocker_ios.pdfIn PDF document text
    • http://vawaguzidatu.pbworks.com/w/file/fetch/144591804/nazimudapaguvi.pdfIn PDF document text
    • http://lifabukis.pbworks.com/w/file/fetch/145035429/gaditiwinolup.pdfIn PDF document text
    • http://wuranosa.pbworks.com/f/64931642827.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c89c3325-a9e7-4ac3-bd03-311dbc1a073b/flysky_fs-gt3c_receiver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87fa3d0a-2b9c-442a-85c1-ea3d47598f49/86767189578.pdfIn PDF document text
    • http://mapijakemifo.pbworks.com/w/file/fetch/144458859/gimirasaginine.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_off0000d1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AC 5232 bytes
SHA-256: 8868e842315b08129d8753c811b2aff8515a137e6f871de3c7c19c62ca3a8fa4
font_01_sfnt_off0000e370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE370 10028 bytes
SHA-256: bff609d5c6d2b3dd14aff6561f6c50fbf3b85459cbe06adaaf14ba836977c666
font_02_sfnt_off000105e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E1 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e