Malicious PDF — malware analysis report

Static analysis result for SHA-256 319b55a02fb6d06d…

MALICIOUS

PDF

71.3 KB Created: 2021-01-06 06:48:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: d1d6aeff8296766c9216ff7b053a3796 SHA-1: 80ffcc29f29b1d2ec26670ad6ef8b132dd0da866 SHA-256: 319b55a02fb6d06dfd0511ee5b104d3227a2feb822dc88bc5eeaf3ea0378fedb
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to known malicious redirectors and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gettraff.ru/123?utm_term=age+of+war+unblocked+3 In PDF document text
    • https://fabexitib.weebly.com/uploads/1/3/4/1/134109013/xuvoliraruwun_fujisagujav_bunofadigepo.pdfIn PDF document text
    • https://xetutinafo.weebly.com/uploads/1/3/0/7/130775845/5825142.pdfIn PDF document text
    • https://mopokelam.weebly.com/uploads/1/3/5/3/135349304/925f3a8e007d.pdfIn PDF document text
    • https://tevupiju.weebly.com/uploads/1/3/4/8/134865653/5649134.pdfIn PDF document text
    • https://cdn.sqhk.co/zusisoko/kzhfWhb/kung_fu_zombie_review.pdfIn PDF document text
    • https://zafimalomaw.weebly.com/uploads/1/3/4/4/134458932/ladetifawexivu.pdfIn PDF document text
    • https://lobusuzagoti.weebly.com/uploads/1/3/4/4/134470260/nusanekomefe_zudupimu_bomewodibasiv.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/lejivugeleguwod/college_algebra_problems_with_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/tepomutunolimuwe.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/native_american_flute_music_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bccb45b-04a7-4a0f-9db8-cec8d3bdaea1/epic_games_world_war_2.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/54658938235.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/18845459158.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d617492d-0e26-46f6-8837-706119dc5d7a/mission_pere_noel_streaming.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_off0000d9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AF 5460 bytes
SHA-256: d7a292b4a9bdce39ec4458a9947b497ee7ebeb8420332ef5ae604bff44cfaadd
font_01_sfnt_off0000ec72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC72 10420 bytes
SHA-256: f3c06b8782513ece3a76b2aaf94cff2cf60f31c003c3ace0893e0d34069e2c39

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