Malicious PDF — malware analysis report

Static analysis result for SHA-256 278659d3a0d248af…

MALICIOUS

PDF

73.3 KB Created: 2021-05-31 20:41:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 01511248e1c0e2a3217fecc1f8a78ccd SHA-1: b6fcaf4a03aaf16404eaee7abda5eac26ec6f786 SHA-256: 278659d3a0d248afa0d087f9b99c8b909e30841e04037dc3bdefac317575e2ca
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 pointing to disposable hosting services, suggesting a link farm designed to redirect users. The primary URL, 'https://philabc.ru/pbw?utm_term=how+to+save+onto+sd+card+android', is presented as a guide but likely serves as a lure for phishing or malware delivery. ClamAV and ML classifiers also flagged this file as malicious, reinforcing the phishing and potential malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://philabc.ru/pbw?utm_term=how+to+save+onto+sd+card+android PDF link annotation
    • https://konegodifoxud.weebly.com/uploads/1/3/1/3/131380175/xixeminusakakekon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422133/normal_605a208767b54.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4404113/normal_60b143e7dc505.pdfIn PDF document text
    • https://pesuwoleze.weebly.com/uploads/1/3/5/2/135295903/913742.pdfIn PDF document text
    • https://joluduloj.weebly.com/uploads/1/3/4/2/134266967/6e468b2ba8b68.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459166/normal_5fc74dea319bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402252/normal_5fd95f74cc378.pdfIn PDF document text
    • https://zujogomute.weebly.com/uploads/1/3/1/4/131483029/2735941.pdfIn PDF document text
    • https://liburesaxus.weebly.com/uploads/1/3/4/3/134372769/webodoserijafune.pdfIn PDF document text
    • https://janaravepok.weebly.com/uploads/1/3/4/8/134886337/fatavuvorutuzunujido.pdfIn PDF document text
    • https://jelisewisu.weebly.com/uploads/1/3/1/4/131410299/pilununisalorufabodo.pdfIn PDF document text
    • https://vokajaxu.weebly.com/uploads/1/3/7/5/137511102/4882115.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lugozamuxika.pbworks.com/w/file/fetch/144412476/12513251710.pdfIn PDF document text
    • http://sizolasipape.pbworks.com/w/file/fetch/144412449/kowevemojopulusirixafuva.pdfIn PDF document text
    • http://xovelezid.pbworks.com/f/nujobusuresukopivurimubu.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/f/55861045075.pdfIn PDF document text
    • http://rugewenuzed.pbworks.com/f/waec_further_maths_past_questions_and_answers.pdfIn PDF document text
    • http://kolelulu.pbworks.com/f/arunachalam_tamil_movie_download_tamilyogi.pdfIn PDF document text
    • http://wuranosa.pbworks.com/w/file/fetch/144415950/1155447454.pdfIn PDF document text
    • http://dekokos.pbworks.com/f/transformers_movie_music_download.pdfIn PDF document text
    • http://wojipag.pbworks.com/w/file/fetch/144421245/nogiwipemalok.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/w/file/fetch/144418371/difference_between_direct_method_and_grammar_translation_method.pdfIn PDF document text
    • http://visetululiv.pbworks.com/f/43942838024.pdfIn PDF document text
    • http://kipizasuzeda.pbworks.com/w/file/fetch/144416733/what_are_the_two_main_theories_of_language_acquisition.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/w/file/fetch/144419745/87516666761.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_off0000e230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE230 5012 bytes
SHA-256: c2414441ecb88423d89823deee469bb45f9503097e87c414494bf76b0f631455
font_01_sfnt_off0000f35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35E 10612 bytes
SHA-256: 56f547696de386f448a4e6ce89bd69c5839c2e418127348713c44071b698e608