Malicious PDF — malware analysis report

Static analysis result for SHA-256 207723039f1fc998…

MALICIOUS

PDF

79.2 KB Created: 2021-01-21 03:01:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: e3aff3b8d607e2d8360db334d7938a13 SHA-1: 738dddfc263a8184fb47541bb8316db5127f9d64 SHA-256: 207723039f1fc9989e04b0e326ad8791c657605c078446565bf4a968d287dc77
214 Risk Score

Malware Insights

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

The sample is a PDF containing a large number of embedded URLs, many of which point to link farms designed to manipulate search engine results. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

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 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.
  • 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://yafferge.ru/aws?utm_term=sirs+qsofa+and+new+sepsis+definition+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379471/normal_5f8e52880d77d.pdfIn PDF document text
    • https://rusaxexuratibu.weebly.com/uploads/1/3/2/6/132680860/5953476.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jugibafamos.epizy.com/binomial_expansion_for_fractional_powers.pdfIn PDF document text
    • https://s3.amazonaws.com/goviwigax/commercial_contract_template_uk.pdfIn PDF document text
    • http://jezuboteseg.epizy.com/tewedikonulozalajeke.pdfIn PDF document text
    • https://s3.amazonaws.com/wibadinavosunom/bavozitapotilovaxadujoxuz.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/cool_math_games_hangman_answers_video_games.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/finding_missing_angles_trig_worksheet.pdfIn PDF document text
    • http://pababevo.epizy.com/25218886801.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/tunnelbear_vpn_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/best_blogspot_news_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/calibre_50_songs.pdfIn PDF document text
    • http://wazuvolixevafo.rf.gd/2451300766.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/fiske_guide_to_colleges_website.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/banjo_movie_song_pagalworld.pdfIn PDF document text
    • http://fagufobukabovu.epizy.com/6215860914.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE243 5324 bytes
SHA-256: 3f459e2d2f74a6723d8690ef7bbf6b3a54d7716db9586712724f6defc0a1dc5c
font_01_sfnt_off0000f47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47E 10840 bytes
SHA-256: 0fef00f2ce14e33e3fdacea31e30c47ddf3162d2bc187debcf80d7a213797dfe
font_02_sfnt_off000119d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D6 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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