Malicious PDF — malware analysis report

Static analysis result for SHA-256 f93b8883b372f750…

MALICIOUS

PDF

85.7 KB Created: 2021-03-31 12:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ab7d2537debce8435eb230e3f7f397c7 SHA-1: ba79c7179b113f9061491c6b87c14f7f6bac0a14 SHA-256: f93b8883b372f75051f4f1ae064b61f9cabc092ae45fac1ba8263ce76d348a05
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The presence of embedded URLs and the nature of the heuristics strongly indicate an attempt to redirect users to malicious or deceptive websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://seumenha.ru/strik?utm_term=snugride+30+lx+strap+adjustment PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4495269/normal_5fe199e267811.pdfIn PDF document text
    • https://cdn.sqhk.co/lekibapufe/tjfNhdz/xbox_game_streaming_preview_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380405/normal_5fcf4da85331d.pdfIn PDF document text
    • https://cdn.sqhk.co/sileluzorupo/maCsieu/75054227986.pdfIn PDF document text
    • https://cdn.sqhk.co/fujonexa/gihb8je/strategic_risk_management_examples.pdfIn PDF document text
    • https://legukofa.weebly.com/uploads/1/3/5/3/135318177/0da4661775.pdfIn PDF document text
    • https://cdn.sqhk.co/kigimijexap/gfZighf/minecraft_hypixel_skyblock_ip_address.pdfIn PDF document text
    • https://cdn.sqhk.co/dibitarebizu/LYhgeje/learn_english_grammar_app.pdfIn PDF document text
    • https://cdn.sqhk.co/mavuxoradis/gfGzi3T/magakevexawiwapu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376879/normal_60164b901a89b.pdfIn PDF document text
    • https://cdn.sqhk.co/xevezele/gYbQmkK/47836187686.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407813/normal_600a5d2982c1f.pdfIn PDF document text
    • https://kazuvamelu.weebly.com/uploads/1/3/0/7/130738637/4fc0c9833b6bcf7.pdfIn PDF document text
    • https://vozozexofevufut.weebly.com/uploads/1/3/1/8/131871902/cdb195231d9a.pdfIn PDF document text
    • https://cdn.sqhk.co/bodovukig/Nif5RRl/88658294205.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486199/normal_5fe570918acdd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451377/normal_5fe4ed6a3e591.pdfIn PDF document text
    • https://kimakinogi.weebly.com/uploads/1/3/0/7/130775446/17b4372e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475564/normal_5fd63d7e00ad9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458125/normal_6042f0be209b1.pdfIn PDF document text
    • https://ziziwatir.weebly.com/uploads/1/3/4/7/134713039/losanuzule_regivejejoza.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/fevobelijogal/how_to_calculate_density_of_water_with_temperature_and_pressure.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/40662855186.pdfIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/android_layer-_list_bitmap_scaletype.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_off0000f404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF404 5832 bytes
SHA-256: bd988cff1cb2e97759ca9e0c28fda8ca2af23abf18c774054debf70aced837c7
font_01_sfnt_off000107cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CC 12212 bytes
SHA-256: 1afe60c7f194dfc3fed9fbf8269c69ac29c00ccfc21189f981f90876d6c8ef53
font_02_sfnt_off0001316b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1316B 16312 bytes
SHA-256: bf8f9ece8d9d74ce2d7a98a07ee1bb8f4056faf702b3b1702118181e85f1b939