Malicious PDF — malware analysis report

Static analysis result for SHA-256 04c1a32040f553f7…

MALICIOUS

PDF

88.1 KB Created: 2021-02-24 12:32:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 89ddc41a3a3b4cc6448315742835aa60 SHA-1: 833533e9aec47c102a818debbd10d0717804ca6a SHA-256: 04c1a32040f553f75aa418cbf7b763b9f4547ea1f1b2691d55979db65469a146
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning model and ClamAV, indicating malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm hosted on disposable domains, pointing to a phishing or malware distribution scheme. The embedded URLs, such as https://bologen.ru/strik?utm_term=onkyo+tx-nr616+hdmi+board+replacement, are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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=onkyo+tx-nr616+hdmi+board+replacement PDF link annotation
    • http://nudistoff.club/booklet_template_illustratorh8p3a.pdfIn PDF document text
    • https://dikasawo.weebly.com/uploads/1/3/5/3/135349802/xadijabetu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487005/normal_602b298a98665.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403565/normal_602f48ba92812.pdfIn PDF document text
    • https://lebilelumebik.weebly.com/uploads/1/3/1/6/131636833/sekowokug.pdfIn PDF document text
    • http://keligekixebar.22web.org/68844667608.pdfIn PDF document text
    • https://ditoleruv.weebly.com/uploads/1/3/5/3/135345680/gegujiwikigogajeme.pdfIn PDF document text
    • http://widarexidifazi.iblogger.org/17493799390.pdfIn PDF document text
    • http://bakelenodizaro.iblogger.org/ada_guidelines_2018_espaol.pdfIn PDF document text
    • http://testrun.ru/barron_s_ielts_practice_exams_with_audio_cds_2nd_edition0twoa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gilesab.rf.gd/8898578533.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/youngblood_brass_band_brooklyn_sheet.pdfIn PDF document text
    • http://gaxodusipif.epizy.com/34741405084.pdfIn PDF document text
    • http://rukinemofe.rf.gd/49422388378.pdfIn PDF document text
    • http://nedajazamofo.epizy.com/60703152148.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/88027923621.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/besuwurimukolikufufo.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/49959476141.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_off0000f847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF847 5772 bytes
SHA-256: bf337a043aa69976c2444b27363ad89920988a4536700212692ec1fa5f18d4d8
font_01_sfnt_off00010bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDB 11116 bytes
SHA-256: 18a64bb83c66fda4a55378518327ee74417e7b9b703023e6c65db5a1f7b307b4
font_02_sfnt_off000131f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F6 20216 bytes
SHA-256: 0421c605ea6ca5230167c1d049e271f72096b043737cd22f8e456525dfadf20b

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