Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc0b4f0cc2a5fe58…

MALICIOUS

PDF

69.5 KB Created: 2021-01-04 20:32:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: fcb1ff3c24e7231aac327384ea120d1e SHA-1: ca8d7fb81f00e3b24094ecada429cab504d1df3b SHA-256: fc0b4f0cc2a5fe5830da1b9e880b67a819c1596aceb6e4c70a2e3d3281cae17a
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a large link farm pointing to other PDFs. The ClamAV detection and ML classifier strongly indicate maliciousness, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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?utm_term=factorio+guide+to+rocket PDF link annotation
    • https://zadumeredevasax.weebly.com/uploads/1/3/1/4/131453870/duvusosumef-nejaxasidepod.pdfIn PDF document text
    • https://cdn.sqhk.co/fedelubu/Hibgiak/konoserilenozipunavotux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389352/normal_5fbd01a6b9677.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446170/normal_5fd086a114bc0.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/mozirolinitaje/davamidujivosufalamojotid.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/waruzufalopuwodina.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/64033236899.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/3294668104.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8964326c-e399-40db-a14f-f5c5073e0b20/the_wolf_of_wall_street_book_review.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_off0000d462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD462 4916 bytes
SHA-256: 163542e99ab1a562d52ca4971541dac5858293159c7cf8fe6cc3f6f7bb1b2414
font_01_sfnt_off0000e530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE530 10720 bytes
SHA-256: ae6a16d86f65ae57d8677a579e81007f1a0fdde18f11675c0b2d60ba47ca45a1