Malicious PDF — malware analysis report

Static analysis result for SHA-256 f12736f2ffa43b4c…

MALICIOUS

PDF

64.1 KB Created: 2020-11-11 05:40:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f005bd2e9b02e9f5819c43240df96b92 SHA-1: de35849b15a44eaf480179cb6871c635b825447e SHA-256: f12736f2ffa43b4cd44169b784e5a0c0a1e864949a09393cb317f71880fc304b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm or SEO manipulation tactic. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/aws?keyword=st.+alban+roe+catholic+school+wildwood+mo
    • https://cdn-cms.f-static.net/uploads/4374518/normal_5f908570bf5e1.pdf
    • https://cdn-cms.f-static.net/uploads/4370071/normal_5f920a9e48dd9.pdf
    • https://cdn-cms.f-static.net/uploads/4447098/normal_5faa5fbd23d65.pdf
    • https://cdn-cms.f-static.net/uploads/4426545/normal_5fa110cda3e25.pdf
    • https://cdn-cms.f-static.net/uploads/4393369/normal_5f9d8ad31c991.pdf
    • https://cdn-cms.f-static.net/uploads/4372383/normal_5f8cab1c8f3c8.pdf
    • https://xusawoji.weebly.com/uploads/1/3/0/7/130739635/wogov_wuvexalotez_disusexetoputud_dafomisosedasi.pdf
    • https://cdn-cms.f-static.net/uploads/4420222/normal_5fa3079a11c4b.pdf
    • https://cdn-cms.f-static.net/uploads/4418973/normal_5f9eecafd6241.pdf
    • https://cdn-cms.f-static.net/uploads/4369506/normal_5f8909006d949.pdf
    • https://cdn-cms.f-static.net/uploads/4388611/normal_5f91afcb5fad1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/880d72c9-10ca-44bf-9df4-dda409472bff/42552699210.pdf
    • https://uploads.strikinglycdn.com/files/ca53eae0-c501-4f3e-9147-ac760b5e8c1e/fevetidetapalodipivof.pdf
    • https://uploads.strikinglycdn.com/files/a534b7df-8934-4a2b-8941-ecc0a0fa456d/zuvav.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_off0000bb9f.bin
f962542ce97651829507c985198bfc42599ef30f44921f31dcedab03c435f8d7
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB9F 5544 bytes
font_01_sfnt_off0000ce61.bin
7f8c283a727489bebc4422843455060839795ce18248064369e32a7a30ecad18
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE61 11180 bytes