Malicious PDF — malware analysis report

Static analysis result for SHA-256 4224f9bf3de1f572…

MALICIOUS

PDF

77.1 KB Created: 2021-03-28 10:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 185288803b59f70b63d9d3179bac6416 SHA-1: faba337b3726b8bfc69de65fc0cd78dfb5a36501 SHA-256: 4224f9bf3de1f572ecd2908517ba0ed437c2d61e26bb755360090c598dc30a88
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ponafet.ru/123?utm_term=indications+for+cholecystectomy+guidelines PDF link annotation
    • https://cdn.sqhk.co/malevevipali/c9gfEij/gemaxuxidivowepuw.pdfIn PDF document text
    • https://cdn.sqhk.co/riragimi/hh8jcid/4719070523.pdfIn PDF document text
    • http://yoptan.space/damamavoxabovobem.pdfIn PDF document text
    • https://cdn.sqhk.co/fapetemiji/YEibjdc/40818651610.pdfIn PDF document text
    • https://cdn.sqhk.co/magimoruki/Hgjvhea/bhagam_bhag_all_songs.pdfIn PDF document text
    • https://cdn.sqhk.co/kukugejekibi/6hdWhf0/steam_price_history_eu.pdfIn PDF document text
    • https://cdn.sqhk.co/kixobaza/Zhejh1v/today_cnn_news_about_ethiopia.pdfIn PDF document text
    • http://boevoenlp.com/foxapolukibamoko95wat.pdfIn PDF document text
    • https://cdn.sqhk.co/zolewiko/ichaDgc/victoria_orenze_brooding_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/luginuwi/GhBhbvo/guzozovuzeg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://535a9070-e28a-464b-adc5-c02ad08be00b.filesusr.com/ugd/9df9d6_82f22a09f3314805b63c70864189570a.pdf?index=trueIn PDF document text
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_0ea761bda53e446f946d157a0cd6e4fe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/wuruvuzujezen.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/why_was_fredo_killed_in_godfather_part_ii.pdfIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/70246728335.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/fetafizajexalatiwumemanow.pdfIn PDF document text
    • https://6fc76513-a17a-4053-940d-bef108f5ea85.filesusr.com/ugd/3a5ef0_90ace6332e6c4dac80113134a40b8a2b.pdf?index=trueIn PDF document text
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_0a4e9bdde87c4c08a7bccd8fd7765f79.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/madis.pdfIn PDF document text
    • https://abf133a7-37c0-4616-b653-d99fd306bce3.filesusr.com/ugd/5c8236_5364a970bff040cb80cfcb8da8ad5890.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ad7bcb2-640d-4c9e-aa2f-34aa5a60ac41/50737903575.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bcc7c47-453a-4ae5-a286-08178ee50069/is_the_alienist_on_netflix.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_off0000f0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A8 5472 bytes
SHA-256: cd08e085e74b5b8c3df6028eebc6be8638e8ceb63e76d32101f376d51048e62a
font_01_sfnt_off00010324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10324 10516 bytes
SHA-256: 7455a04719b453980f8d5cfa74ef4058239de1670d2afb1aac2a862a67147124