Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7d0120317ca9e79…

MALICIOUS

PDF

94.7 KB Created: 2021-04-01 11:03:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 12e28bd8ba4c38d3f925e0869e5b9591 SHA-1: 6233bbcd927a2db7137b2f3e56a5412ae6884812 SHA-256: d7d0120317ca9e79702fec294252bffb0c4548a606bc8e18d8e365ab483d55c0
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a link farm for SEO purposes. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM indicate that the document's primary function is to redirect users to numerous external URLs, some hosted on disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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/award?keyword=cetosis+peligros+pdf PDF link annotation
    • http://wofijolusiga.iblogger.org/pifofiduxuwami.pdfIn PDF document text
    • http://rexifiru.iblogger.org/wufusapivasovaxefa.pdfIn PDF document text
    • https://cdn.sqhk.co/misusulebix/toRbjh4/super_nova_galaxia.pdfIn PDF document text
    • https://cdn.sqhk.co/gefizorabubi/hcEighd/try_not_to_laugh_challenge_youtube_clean.pdfIn PDF document text
    • https://cdn.sqhk.co/kosadara/7ZNzhhU/german_word_jammer.pdfIn PDF document text
    • https://cdn.sqhk.co/pevizopubok/ge2Qghc/90153523047.pdfIn PDF document text
    • http://biwejobezimije.22web.org/1874979788.pdfIn PDF document text
    • https://gisunada.weebly.com/uploads/1/3/1/4/131409009/9243142.pdfIn PDF document text
    • https://tonefomemozev.weebly.com/uploads/1/3/4/4/134458928/wufunusomem-vukitok-tafalomumividu-gunagubelojaju.pdfIn PDF document text
    • http://mevukavotidu.getenjoyment.net/libro_poder_de_orar_de_madrugada.pdfIn PDF document text
    • https://cdn.sqhk.co/gukokefa/d6xrYnL/dalijapijaxuroz.pdfIn PDF document text
    • https://xinuluparos.weebly.com/uploads/1/3/0/9/130969110/jikonuzamoj-lodosanodu-kafajanoj-dawariden.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/girilifawuxi/logemepokimevazaz.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/sofaseluruxasemijozu.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/how_to_easy_science_experiments.pdfIn PDF document text
    • http://rakoduwe.epizy.com/jojajuwaze.pdfIn PDF document text
    • http://xefejada.epizy.com/python_for_beginners_freecodecamp.pdfIn PDF document text
    • http://xafibejijopo.atwebpages.com/chemistry_book_11.pdfIn PDF document text
    • https://s3.amazonaws.com/lawakux/63154957082.pdfIn PDF document text
    • http://demuremapinob.epizy.com/5155431438.pdfIn PDF document text
    • http://zutugunosivupa.epizy.com/psc_bulletin_january_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/nuzukojexagu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AC 4904 bytes
SHA-256: eb2585e205888df919568ce8375ded63b9ab9b76edeb1cfe682340caee385bf2
font_01_sfnt_off00012662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12662 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off00012ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF0 11732 bytes
SHA-256: 4a683ff9ae3cfff2b0119460614855b375c2eedf86c59addedf420b1a79eff49
font_03_sfnt_off00015561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15561 16312 bytes
SHA-256: bf8f9ece8d9d74ce2d7a98a07ee1bb8f4056faf702b3b1702118181e85f1b939