Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ad70b40e8fdb186…

MALICIOUS

PDF

65.4 KB Created: 2020-12-03 05:42:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f7f4cd4ccc30628cd5d2a29fbafd85a SHA-1: 1c02f6090d2cefac87f4d71c1b9743c6edc62b0b SHA-256: 8ad70b40e8fdb1866203a54ffc2f40a487dbcabe780953fbb95a9745365d368b
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, with the primary one being `https://trafficel.ru/strik?utm_term=story+of+icarus+pdf`. The presence of numerous external links suggests a link farm or phishing attempt, aiming to redirect users to potentially harmful content. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=story+of+icarus+pdf
    • https://cdn-cms.f-static.net/uploads/4488815/normal_5fba877f3a87d.pdf
    • https://cdn-cms.f-static.net/uploads/4457861/normal_5fa665bcd6cff.pdf
    • https://vivazezege.weebly.com/uploads/1/3/4/0/134041722/muxifomugonotop.pdf
    • https://cdn-cms.f-static.net/uploads/4381534/normal_5fa6999fd09ee.pdf
    • https://cdn-cms.f-static.net/uploads/4373304/normal_5f8ab415305ff.pdf
    • https://takotowi.weebly.com/uploads/1/3/4/3/134356266/6b623f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd376e04971d5155d5cdd6/1606236017174/marvel_champions_release_order.pdf
    • https://uploads.strikinglycdn.com/files/032495ec-e2ed-40cf-a7b6-e7145b3f5d0f/82406532673.pdf
    • https://static1.squarespace.com/static/5fc58ea3084698658e7deaef/t/5fc818bb43b29e7a5ae72238/1606949051362/dumb_ways_to_die_3_mod_apk_revdl.pdf
    • https://uploads.strikinglycdn.com/files/15f9072f-ce28-4951-9b1f-01885797e1e7/xudigelevigeduk.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_off0000c50b.bin
a01f4ad45f541741beb55cfc4baf0dee97137b92d4b2a1fb0f9cdc8a7772c544
pdf-font-stream PDF embedded font (sfnt) at offset 0xC50B 5324 bytes
font_01_sfnt_off0000d73d.bin
d102058190681586327ac0153a34d8156020a3da3c2255afbbca2cb80433d66a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD73D 9904 bytes