Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5cfc85d7d37c512…

MALICIOUS

PDF

88.5 KB Created: 2021-04-06 11:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 518781e3d831b2a1d375378e8975d5f3 SHA-1: b48f67096e560c6ff5310dfa430b7b8236361915 SHA-256: e5cfc85d7d37c512c237ec13237ac2db00ad47c73871a50f04ff82f38e521942
206 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicative of a link farm used for SEO manipulation or phishing. The 'SE_CALLBACK_LURE' heuristic and the presence of a phone number in the document body strongly suggest a callback phishing or tech support scam attempt. While no scripts were explicitly extracted, the ML classifier and ClamAV detection confirm malicious intent, likely involving redirection to malicious sites or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://crophysi.ru/strik?utm_term=panasonic+kx-tgc220als+cordless+phone PDF link annotation
    • https://kefubawivamati.weebly.com/uploads/1/3/5/3/135304753/d16507e5.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CvgiczF/ragaduwojak.pdfIn PDF document text
    • https://cdn.sqhk.co/tiruxugajo/bj9ifjd/xivex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405197/normal_604701722c01f.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/geRNqih/crazy_cell_phone_statistics_canada_2017.pdfIn PDF document text
    • https://cdn.sqhk.co/nilamemiw/jgibJgf/black_male_single_braid_hairstyles.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414682/normal_6027f53cd22b5.pdfIn PDF document text
    • https://xixinuwomisit.weebly.com/uploads/1/3/1/4/131437484/bd7236d8ca25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476142/normal_602365fce7cde.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415052/normal_5fdcad62560e0.pdfIn PDF document text
    • https://pufukowog.weebly.com/uploads/1/3/4/5/134583281/3181276ea5.pdfIn PDF document text
    • http://mafesilotob.iblogger.org/91994645878.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410027/normal_6028e66518900.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470835/normal_605a36d4b4c07.pdfIn PDF document text
    • https://cdn.sqhk.co/zoraxiraga/pZXcMyQ/ccna_intro_exam_certification_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/daborofus/dggKgib/zefolotejerakosuza.pdfIn PDF document text
    • https://rowusebejaron.weebly.com/uploads/1/3/1/6/131637242/a3642a0807c8.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
    • http://mobosefevexaxep.rf.gd/cavatine_saint_saens.pdfIn PDF document text
    • http://figapow.epizy.com/75401446311.pdfIn PDF document text
    • http://xubixetumed.rf.gd/48442099777.pdfIn PDF document text
    • http://viladitotaxuf.epizy.com/somivevatipas.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_off00010d33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D33 5564 bytes
SHA-256: 395e0b8d0c8c9dab9a835b0df7ab059081b8983330ccc4cf26da0424532c1d3a
font_01_sfnt_off00012012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12012 11376 bytes
SHA-256: 9dbc4021c1fff27f8310285cad91e77a0a8f460889878decfaa952f5c4753e64
font_02_sfnt_off000146b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146B5 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34