Malicious PDF — malware analysis report

Static analysis result for SHA-256 e59e005cc588ff5c…

MALICIOUS

PDF

74.9 KB Created: 2020-11-19 07:04:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 0712c005b408d4df7dc709daf7702ebc SHA-1: 76c945dd6157b313395975e738e8680be55d3923 SHA-256: e59e005cc588ff5c85cbb1d332b59d5db871c4e0f174323c6313b808b44a3326
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • 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://traffine.ru/123?utm_term=ergonomic+mouse+pad PDF link annotation
    • https://rivisoni.weebly.com/uploads/1/3/0/7/130739016/7eddd29afe35.pdfIn PDF document text
    • https://tuvonozesafuk.weebly.com/uploads/1/3/4/6/134600303/3046761.pdfIn PDF document text
    • https://dajapofijakaf.weebly.com/uploads/1/3/4/2/134266914/denejavububakuletupi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465131/normal_5fadcad10635f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381756/normal_5fa8008ea12b8.pdfIn PDF document text
    • https://radigaligoled.weebly.com/uploads/1/3/4/3/134333621/7158f1a0b5.pdfIn PDF document text
    • https://bujugerevik.weebly.com/uploads/1/3/4/6/134677448/xidusin.pdfIn PDF document text
    • https://vekerarefatada.weebly.com/uploads/1/3/4/8/134868636/7455737.pdfIn PDF document text
    • https://rozemubopul.weebly.com/uploads/1/3/4/7/134719755/jaziposojabixex.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/tadovu/japanese_sewing_pattern_book.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/online_recovery_version_bible_old_testament.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/parry_positions_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69b24edf-ac54-4381-87b3-2bffa2aa3222/brave_story_game.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_off0000e885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE885 5320 bytes
SHA-256: dfe9b002e1ad426189377a863d1e70a07448841f5feb78d011a3044a1e8f6990
font_01_sfnt_off0000fa8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8F 10564 bytes
SHA-256: a636c477e46b7f6cfa6882685ba7b855a731c16138148b5c2af6fd3f18a6d80b