Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f1173227dc7f28f…

MALICIOUS

PDF

76.7 KB Created: 2021-01-05 21:56:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 92f8b7c8a1e255cf66b1e09fbbfc5fca SHA-1: b405d51e97f5faa118d6daef48a436a1face4dd0 SHA-256: 7f1173227dc7f28f15bed31b3626aa2c527ba53f011042820c38931419d033e1
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a large number of external links, many hosted on disposable domains, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs and the heuristic findings of a 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' support this assessment.

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://trafffe.ru/aws?utm_term=java+arrays.+copyofrange+performance PDF link annotation
    • https://tololomajaju.weebly.com/uploads/1/3/4/4/134472688/6873210.pdfIn PDF document text
    • https://wedutigumufezeb.weebly.com/uploads/1/3/4/6/134659425/f817b87180c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443624/normal_5fa67151a169f.pdfIn PDF document text
    • https://cdn.sqhk.co/zetanitanedo/vjahiic/formula_acceleration_1.pdfIn PDF document text
    • https://pirovosarelivo.weebly.com/uploads/1/3/1/4/131406751/2d740.pdfIn PDF document text
    • https://cdn.sqhk.co/kosuxatune/cijidig/gerigilewosore.pdfIn PDF document text
    • https://patilufadan.weebly.com/uploads/1/3/4/4/134462925/13d9fba424ec.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/kozavowewida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2c840eb-c791-44cf-9cfe-103fefec6ead/vocab_workshop_level_g_unit_8_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ba3f251-c928-4d2e-94ab-1135930301aa/4607998218.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3eb3c748-09eb-41f8-8374-afaf13fedb5b/catherine_ni_houlihan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afed5aa9-d845-4d79-b265-61f9691bef1c/74996048242.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_off0000ead2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD2 5484 bytes
SHA-256: 2fea67bcc0a6686ff2804baaf0587f5d0e57f1265354ef8193a737efa4dd525b
font_01_sfnt_off0000fd88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD88 11940 bytes
SHA-256: b62e4e107b57bce30dd4ae5098c00ebf003d8011c0c2112c3aacf236a5dc5c47

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