Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc4ee96c6b74816e…

MALICIOUS

PDF

65.0 KB Created: 2020-12-24 18:13:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8cd3514d531a824ab016c0b946d5ac13 SHA-1: ecbf03fc0b52f114c925103fec26539afca2baf3 SHA-256: bc4ee96c6b74816e7de3d45245f0fe21cb122d51af1c87acf1e7e68d62e2f97e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous external links, with one specifically pointing to a URL that appears to be part of a link farm or SEO manipulation tactic. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious sites or download further payloads.

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/aws?utm_term=kerboodle+answers+a+level+ocr
    • https://cdn.sqhk.co/dutebevon/ibih4jC/vasosudijiz.pdf
    • https://nelajelax.weebly.com/uploads/1/3/2/7/132712676/puxudejanofuta.pdf
    • https://rulakufip.weebly.com/uploads/1/3/4/4/134489053/dubema_gomami.pdf
    • https://cdn.sqhk.co/nivipanevi/eDgjvjf/smith_knife_sharpening_system_review.pdf
    • https://cdn.sqhk.co/vekasurox/kiajejh/59813044913.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/cfb5c162-f137-4fc6-bd1c-5a8f6e9bb4c4/reasons_for_jesus_facebook.pdf
    • https://s3.amazonaws.com/litunux/43213145536.pdf
    • https://uploads.strikinglycdn.com/files/675050c3-8ebc-42d4-9d84-6c6b6b94af5b/datejovix.pdf
    • https://uploads.strikinglycdn.com/files/2c36cd5a-3d39-4a83-bb76-66e80c7ef59b/that_time_i_got_reincarnated_as_a_slime_web_novel_wiki.pdf
    • https://uploads.strikinglycdn.com/files/741ee7a5-30e5-40a4-8bf8-9dd492c300e6/fovapaduzugizuviwosarofu.pdf
    • https://uploads.strikinglycdn.com/files/2759b53b-e466-4c96-a733-88111268be49/22079904793.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_off0000c2f1.bin
3c4db88397d8468616eeb35bd35a609cfc3ac441f10316cf9373683f2abf8788
pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F1 5192 bytes
font_01_sfnt_off0000d4c3.bin
aa84f93d7a3fea7f45cade234a8f84f0581f3e0b7a8e02e19baa7a526c6e772c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C3 10240 bytes