Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a69644a0964814…

MALICIOUS

PDF

61.4 KB Created: 2020-11-18 12:34:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f110f7c8533c3e3522728c5719f73bc5 SHA-1: da93d46c0c275531b4c394ff02503104f836ce52 SHA-256: 77a69644a0964814dadfb15c90a905e676a12a79adb27cd3779d84e1bd50848c
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_SEO_LINK_FARM, indicating it's part of a link farm designed to generate traffic or distribute malicious content. The embedded URL 'https://trafffi.ru/aws?utm_term=jurnal+gametogenesis+pdf' suggests a phishing or content-luring attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

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=jurnal+gametogenesis+pdf
    • https://cdn-cms.f-static.net/uploads/4387232/normal_5f9f6c511fca7.pdf
    • https://cdn-cms.f-static.net/uploads/4402720/normal_5f942bf581444.pdf
    • https://cdn-cms.f-static.net/uploads/4383146/normal_5f8fd1b0e5e50.pdf
    • https://rivisoni.weebly.com/uploads/1/3/0/7/130739016/1501936.pdf
    • https://cdn-cms.f-static.net/uploads/4384323/normal_5f934a4b5e030.pdf
    • https://lajojixuvoporor.weebly.com/uploads/1/3/0/7/130738555/8aaf84057cafd.pdf
    • https://cdn-cms.f-static.net/uploads/4454682/normal_5fa9b00ddec68.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/purixifusipelid/kosixupivabijimebexabenov.pdf
    • https://uploads.strikinglycdn.com/files/082a5e2d-0183-47c2-961c-bd1c69dc0cf9/a_sound_of_thunder_essay.pdf
    • https://uploads.strikinglycdn.com/files/b45829e7-af19-47e7-955b-80229dc4c11f/national_physical_therapy_examinatio.pdf
    • https://s3.amazonaws.com/pewebopufupe/netewizevawe.pdf
    • https://s3.amazonaws.com/petubapizo/dragon_ball_af_young_jijii_vol_15.pdf
    • https://uploads.strikinglycdn.com/files/e9bcd927-6dc7-485a-a2d8-5822bb008c51/linuxatejoporubakuwodapez.pdf
    • https://uploads.strikinglycdn.com/files/2de334bc-a6eb-4ec4-82c9-20d2d4677014/nuwegozovudavumot.pdf
    • https://uploads.strikinglycdn.com/files/7e13431e-414d-4195-a5e7-4b07e264856f/flying_star_feng_shui.pdf
    • https://s3.amazonaws.com/tosevud/82762006338.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_off0000b56e.bin
dbee6ad54a9c2c38160e481d93185708e3b345bdefd83d16b2690e8a6121b193
pdf-font-stream PDF embedded font (sfnt) at offset 0xB56E 5348 bytes
font_01_sfnt_off0000c787.bin
8d8f55395a7f74d2245fcd93856c61e6f59829db57d15fde9ec7488c6316f9da
pdf-font-stream PDF embedded font (sfnt) at offset 0xC787 9740 bytes