Malicious PDF — malware analysis report

Static analysis result for SHA-256 13b93eaa8319de98…

MALICIOUS

PDF

76.4 KB Created: 2021-04-20 05:23:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f67101880babf47384fd713cf1762ad7 SHA-1: 111c449cccba23830abb3cf39d6e7845850c86b9 SHA-256: 13b93eaa8319de984ef671d1c49f1ffb4ad9f31ea50fac6690f90165b7bac79d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://maypoin.ru/strik?utm_term=trane+xl80+furnace+pressure+switch PDF link annotation
    • http://olymp-trade.top/javefipexet0lr1.pdfIn PDF document text
    • http://sexedate69.site/80855359967l2xc4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451940/normal_6000b205b2394.pdfIn PDF document text
    • http://helpforteam.com/python_learning_gamec6qcy.pdfIn PDF document text
    • http://fikakutipid.mygamesonline.org/18606886836.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366343/normal_6048330d18a43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453747/normal_5fd3553369a8c.pdfIn PDF document text
    • http://fibisazorowax.mypressonline.com/75559900135.pdfIn PDF document text
    • http://paxabak.mypressonline.com/behaviorism_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485799/normal_6059d5c535225.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415327/normal_600019da32e06.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tediguku.atwebpages.com/gusate.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/bose_lifestyle_remote_control_settings.pdfIn PDF document text
    • http://sonogobujajeva.rf.gd/subadazumawewijuzeg.pdfIn PDF document text
    • http://jifobobaganut.epizy.com/mazezojegejorelapitaw.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/legend_of_zelda_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/41098507716.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/is_the_norelco_series_7000_waterproof.pdfIn PDF document text
    • http://zofazule.rf.gd/bullying_in_schools_articles.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_off0000edf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF5 5548 bytes
SHA-256: 72d558bca21421604d86f2743f8d5fd138747def3123b45726115b209acb03e3
font_01_sfnt_off000100e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E4 10432 bytes
SHA-256: d36566f03e98b6544a32fbd2838b1e2a8758e87be7ed7ec773da21e013af8cff