Malicious PDF — malware analysis report

Static analysis result for SHA-256 faf08699d4434a4b…

MALICIOUS

PDF

73.2 KB Created: 2020-11-25 16:11:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55930b9f52981c67b3ee97628bf59591 SHA-1: 58fc201b1eee0a12f845bd3a5e6a12d796046c6b SHA-256: faf08699d4434a4ba1233ea0d25ba16bb0af58b555cea3a5f9a2abf25cfa9476
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or SEO manipulation attempt. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely to redirect users to further malicious content or phishing pages.

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://trafffi.ru/123?utm_term=seaborn+style+context
    • https://jezagegilefu.weebly.com/uploads/1/3/4/3/134307882/nivajekoduxazugil.pdf
    • https://jololese.weebly.com/uploads/1/3/4/5/134599323/tifud.pdf
    • https://cdn-cms.f-static.net/uploads/4379486/normal_5f9893e140d35.pdf
    • https://gidepezugubuwo.weebly.com/uploads/1/3/4/7/134766768/6222999.pdf
    • https://gupaxapofigovi.weebly.com/uploads/1/3/4/3/134356466/rufugo.pdf
    • https://cdn-cms.f-static.net/uploads/4369927/normal_5f8cf3a5a58c0.pdf
    • https://fomukudir.weebly.com/uploads/1/3/4/4/134403856/bubefukev.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/suxiweke/can_bus_system.pdf
    • https://s3.amazonaws.com/julexekubaj/twitter_video_via_link.pdf
    • https://s3.amazonaws.com/pesetufavo/maxitababofibuto.pdf
    • https://uploads.strikinglycdn.com/files/7850cba0-0357-4263-bd33-4d8740632c69/fizevigevuviganasemex.pdf
    • https://s3.amazonaws.com/zuxadol/zegivifunowimat.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d008.bin
5f2781678b9df02ceeecca711dbfe956de83a04fe51835804af6132557dae450
pdf-font-stream PDF embedded font (sfnt) at offset 0xD008 4944 bytes
font_01_sfnt_off0000e0e2.bin
d0ce6d5dacdd8f3b2679d59ac579a295e081b8769983c751de9155cfa292ec2c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E2 12040 bytes
font_02_sfnt_off00010a32.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A32 4324 bytes