Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dd141d1ec11c1de…

MALICIOUS

PDF

69.6 KB Created: 2020-11-20 14:51:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8066a4a809a09017d33864f90591d9b9 SHA-1: 7b415f6f22d23177f07262b3ce4687c1e9b51ed2 SHA-256: 8dd141d1ec11c1de2fee6e5ca06aac914f8c99b472016ba8fcf118df262dd066
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. The document contains a large number of external links, suggesting it functions as a link farm or a lure to a malicious site. The embedded content, though heavily obfuscated, suggests the document's purpose is to redirect users to external resources, potentially for further exploitation or credential harvesting.

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-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://trafficel.ru/123?utm_term=second+life+physics+guide
    • https://cdn-cms.f-static.net/uploads/4376856/normal_5f8a8689000b3.pdf
    • https://cdn-cms.f-static.net/uploads/4372721/normal_5f8b945f68b6b.pdf
    • https://cdn-cms.f-static.net/uploads/4402503/normal_5f9cd46b3c741.pdf
    • https://cdn-cms.f-static.net/uploads/4394082/normal_5fb58c537bd06.pdf
    • https://dumejolizaxoko.weebly.com/uploads/1/3/0/8/130814858/fikeloligusofewejumo.pdf
    • https://ruvetuse.weebly.com/uploads/1/3/4/6/134618438/bizutesajuzot-sujebajilawu.pdf
    • https://cdn-cms.f-static.net/uploads/4366399/normal_5f8a1a2d86a8c.pdf
    • https://cdn-cms.f-static.net/uploads/4412762/normal_5fa5f0863481d.pdf
    • https://gefozovunipor.weebly.com/uploads/1/3/4/5/134585144/8f6212db8a43ff.pdf
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/1754027.pdf
    • https://cdn-cms.f-static.net/uploads/4421460/normal_5f9b2b8f25825.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/db1eba60-3168-4682-b36a-494406b585ae/25831898689.pdf
    • https://uploads.strikinglycdn.com/files/514dacb8-645a-40cb-8f77-694382b3e5f3/essential_communication_ronald_adler.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_off0000c88e.bin
ae09a941310ff68f3307bf9f8c0890553ff94e25f1cf9873e7e89420cbd98937
pdf-font-stream PDF embedded font (sfnt) at offset 0xC88E 5116 bytes
font_01_sfnt_off0000d9e9.bin
800cc15339363a8b56cace0d2e1b7ace51b60ca54f620e77f456028864666525
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E9 9940 bytes
font_02_sfnt_off0000fbdb.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDB 4324 bytes