Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f6f23b4d8aea567…

MALICIOUS

PDF

71.4 KB Created: 2020-12-14 02:12:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: afd617033b6f256a47495c082b2a8ce9 SHA-1: 7b16ce093a5a6c960e2500fe56592e05f8d3a167 SHA-256: 2f6f23b4d8aea567274bc721be303b4e5c86e74803affc186116502a69a07318
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common technique for link farms and phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URLs, such as 'https://trafficel.ru/aws?utm_term=cobol+interview+questions+with+answers', are likely used to redirect users to malicious sites or download further payloads.

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://trafficel.ru/aws?utm_term=cobol+interview+questions+with+answers
    • https://cdn-cms.f-static.net/uploads/4426677/normal_5fba7e7baaf42.pdf
    • https://cdn-cms.f-static.net/uploads/4388169/normal_5f9461fe47123.pdf
    • https://cdn-cms.f-static.net/uploads/4487902/normal_5fb50c0cd6d67.pdf
    • https://static.s123-cdn-static.com/uploads/4446649/normal_5fc616a189efb.pdf
    • https://cdn-cms.f-static.net/uploads/4383566/normal_5f9975ea9931d.pdf
    • https://karezolakep.weebly.com/uploads/1/3/1/3/131398125/afb0c6b4057.pdf
    • https://goxapumub.weebly.com/uploads/1/3/4/8/134884232/7c1a34.pdf
    • https://static.s123-cdn-static.com/uploads/4414352/normal_5fce8aad44b5e.pdf
    • https://zaxizibu.weebly.com/uploads/1/3/4/6/134672664/26c510.pdf
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/6305828.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vuterijoze/62042749464.pdf
    • https://s3.amazonaws.com/tekujel/nafofogusatiginakefus.pdf
    • https://s3.amazonaws.com/mamukawaxatali/dovowirisagisaj.pdf
    • https://s3.amazonaws.com/zuxadol/80102994448.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_off0000dc90.bin
b3bf1c4c457ffc4e0ecf093f5f2389d08e8c8df761c9dd3baba5b21dfb05062b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC90 5096 bytes
font_01_sfnt_off0000edef.bin
7a6b22f98550c319d524d4a02e2df8eebef54f3937cd6111da3af9f82d73134c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEF 10112 bytes