Malicious PDF — malware analysis report

Static analysis result for SHA-256 7928603fdd8ed7ab…

MALICIOUS

PDF

68.2 KB Created: 2020-12-23 01:10:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6c476f2305ea40f296b6e7ab4ab17f5 SHA-1: d4603956abf32a38e02d17437261f8962113da65 SHA-256: 7928603fdd8ed7ab8c392fa7d52b2d02f9de28c6baae07500f5766120c1c05a5
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one specifically pointing to a URL that appears to be a search result for free software. This suggests a phishing or malware distribution attempt. The presence of a large number of external links, including a link farm heuristic, indicates an attempt to direct users to external resources, potentially for malicious purposes. ClamAV detection further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafftec.ru/strik?utm_term=photo+mixer+free+download+windows+7+full+version
    • https://gemigefe.weebly.com/uploads/1/3/4/6/134602098/2228386.pdf
    • https://cdn-cms.f-static.net/uploads/4488133/normal_5fbb1a589cb98.pdf
    • https://cdn-cms.f-static.net/uploads/4382412/normal_5fd8a06f0db6b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dusined/bookworm_kartell.pdf
    • https://uploads.strikinglycdn.com/files/c9ad2742-fd40-444c-81df-8f035c28171d/vokobosuxadidoro.pdf
    • https://s3.amazonaws.com/muwomapotumugi/circular_saw_cut_sheet_metal.pdf
    • https://uploads.strikinglycdn.com/files/204d7820-f870-4fb0-a69a-437d6ff8bc61/zezog.pdf
    • https://uploads.strikinglycdn.com/files/fafe6f6c-b2e4-4fb1-ae7d-8f07d2736ea3/58592637310.pdf
    • https://s3.amazonaws.com/bejokazemur/st_isaac_jogues_church_wayne_pa.pdf
    • https://uploads.strikinglycdn.com/files/bb454ad5-ad9d-4012-bdc1-f42129627f54/a_45_year_old_man_had_coronary_artery_stents_placed_2_days_ago_acls.pdf
    • https://uploads.strikinglycdn.com/files/e74712a6-b6a4-419a-bd34-2f69ff4e7163/12509938396.pdf
    • https://s3.amazonaws.com/kotenu/embedded_questions_worksheet.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf29.bin
a8de20343e95ee0e1ae3cc8b879408dc82e7ed9c54a6e10abad5c22af0a5a1f0
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF29 5448 bytes
font_01_sfnt_off0000e1a5.bin
e79679f52bde9fcf2d421c3e1438ba0d06503c956ff76018dc51f97e60964133
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A5 10032 bytes