Malicious PDF — malware analysis report

Static analysis result for SHA-256 269c505d401438de…

MALICIOUS

PDF

59.7 KB Created: 2020-11-21 23:41:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfd198a6d91db9480818fb6713eba49b SHA-1: 76bbc96c04122402f30adac3151d1c67ecc3fc4d SHA-256: 269c505d401438de9b429f4f37a2e34060e4166dcf2a97b8da2085a0a8067169
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and extensive external links are indicative of techniques used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafffe.ru/aws?utm_term=books+of+the+bible+study+guide+pdf
    • https://tupipukevoluda.weebly.com/uploads/1/3/4/0/134041298/ca86d.pdf
    • https://pozagawev.weebly.com/uploads/1/3/4/5/134580069/kurenujubala.pdf
    • https://cdn-cms.f-static.net/uploads/4412775/normal_5f9b6cd4ca164.pdf
    • https://sebidodeg.weebly.com/uploads/1/3/4/4/134438526/vokat.pdf
    • https://firupewuvub.weebly.com/uploads/1/3/4/3/134330425/2334089.pdf
    • https://cdn-cms.f-static.net/uploads/4390328/normal_5f94d026a9883.pdf
    • https://cdn-cms.f-static.net/uploads/4383804/normal_5f938c33c9ebc.pdf
    • https://cdn-cms.f-static.net/uploads/4421048/normal_5fa70b39263a3.pdf
    • https://cdn-cms.f-static.net/uploads/4387718/normal_5fad5bcd50015.pdf
    • https://cdn-cms.f-static.net/uploads/4417669/normal_5faa212772f37.pdf
    • https://cdn-cms.f-static.net/uploads/4423460/normal_5fa1ae96b7a6d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nijudow/1157240710.pdf
    • https://uploads.strikinglycdn.com/files/cd2300c6-85b9-439b-9822-0048ceede6e7/69172092177.pdf
    • https://s3.amazonaws.com/lazolu/ginuzawivikuvir.pdf
    • http://www.cbc.ca/arts/story/20
    • 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_off0000aac7.bin
a435f227550d7b2e8616142d017fe355fa3843a3d0a5c6f3f59334b893aa8143
pdf-font-stream PDF embedded font (sfnt) at offset 0xAAC7 5352 bytes
font_01_sfnt_off0000bd0f.bin
f8254dd495df782a919cb05ae9e20df7c7276d6852e1763037860d804cdb7ff0
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD0F 10780 bytes