Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a9730419cf9823…

MALICIOUS

PDF

78.2 KB Created: 2021-04-28 00:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: f896d79ecd80e2e749e8a43837774328 SHA-1: d8449e22f82cd937699114d608a598ff57ab4138 SHA-256: b4a9730419cf9823e215f884f23ab4c8cf3c96c68f0cd47860ac35e7ce25ab92
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains and link farms, indicating a phishing or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/strik?utm_term=how+to+work+monster+illuminessence PDF link annotation
    • https://cdn.sqhk.co/zanotunuzi/aBAhahe/zavidiriduvupuxib.pdfIn PDF document text
    • https://cdn.sqhk.co/bopibege/gojaTib/world_block_minecraft_3d_file.pdfIn PDF document text
    • https://zujuwedidikaf.weebly.com/uploads/1/3/4/3/134375258/fepebuxelim.pdfIn PDF document text
    • https://femesavez.weebly.com/uploads/1/3/1/3/131383434/naleguv.pdfIn PDF document text
    • https://cdn.sqhk.co/kajipazuto/gi8gfjj/words_crush_hidden_words_apk.pdfIn PDF document text
    • https://buxiniti.weebly.com/uploads/1/3/4/3/134309366/kenet.pdfIn PDF document text
    • https://resigigemi.weebly.com/uploads/1/3/5/3/135326159/safopakizimevol-kivev-wirolej-dakolifaxafesed.pdfIn PDF document text
    • https://cdn.sqhk.co/supajoni/bhehigc/pisilonig.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/Jr2ie0W/karug.pdfIn PDF document text
    • https://zuwuroxiver.weebly.com/uploads/1/3/1/0/131070979/gitux_pabivin_mejepezozusur.pdfIn PDF document text
    • https://cdn.sqhk.co/tabafopevajo/ejgjdDK/argos_catalogo.pdfIn PDF document text
    • https://cdn.sqhk.co/tedogegez/geqYij0/agent_ransack_ignore_folders.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/lusabifef/neet_2018_answer_key_brilliant.pdfIn PDF document text
    • https://fb075467-9d00-46c6-93ac-2b777f5e584b.filesusr.com/ugd/8bcd66_0b467dd8f128401f8c39bd1276cac669.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/jonopuketoran.pdfIn PDF document text
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_fbf02bfad7a043fa959c54368d663546.pdf?index=trueIn PDF document text
    • https://8e0cabef-d481-4215-b437-8a5fc4e4723c.filesusr.com/ugd/f41140_653d47e6aca54aff85f75510730ad48a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/canteen_song_mp4.pdfIn PDF document text
    • https://edb7bb8d-792a-4213-93ec-7f573d37cc74.filesusr.com/ugd/bfd504_76e6e8c763fc4030b2d4c7f88d69715d.pdf?index=trueIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_910b184a81224b4ea45b55f461453cd0.pdf?index=trueIn PDF document text
    • https://80c93ba6-74df-4afb-9852-3a83eaba20e3.filesusr.com/ugd/4cf28d_bb541009cc194fd19dbdd95866a4d35b.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE458 4736 bytes
SHA-256: 7ae896c45341e53ae73a186327783c11a2d75a97dbe8e5bfbd6311b05b4fd435
font_01_sfnt_off0000f464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF464 11716 bytes
SHA-256: dfbd6a75e4e9b74894c18fa09d9980ca4dbeb10862c5c7a57b100da5d1d1ce85
font_02_sfnt_off00011ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA3 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f