Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2a3ee6e32c7b084…

MALICIOUS

PDF

169.2 KB Created: 2021-02-08 19:15:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3ab36ef115825e70cb89a9eb20f8c832 SHA-1: 99760f761fd2f7ea92b7b82ab4f74a9af287a956 SHA-256: f2a3ee6e32c7b08498c52b4aa35ec84abfa4a1300e9c0c7e58d0015d42ccf1b0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to obscure the true malicious destination. The document body, though heavily obfuscated, suggests a lure for a free PDF download, aligning with a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://druttle.ru/123?utm_term=astm+e165+pdf+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4501385/normal_5fe24b60c3a40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414353/normal_601ae543efdba.pdfIn PDF document text
    • http://mybatut.store/zomijelivomugisuvip947yd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367643/normal_600d5154d2040.pdfIn PDF document text
    • http://maska-respirator.com/lightning_thief_graphic_novel_downloadgymaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416811/normal_5fd22319dd405.pdfIn PDF document text
    • http://braco.ru/plants_vs_zombies_2_characters_wiki7tygk.pdfIn PDF document text
    • http://sosyaltakipcipanelin.com/377725593118ojj8.pdfIn PDF document text
    • http://fojibewuf.iblogger.org/kindergarten_phonics_worksheets_free.pdfIn PDF document text
    • http://pet-guru.shop/migewulasowiviwix6f621.pdfIn PDF document text
    • https://zibataluguxomi.weebly.com/uploads/1/3/1/3/131382491/2133212.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383131/normal_601d657e2e745.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391649/normal_601ccd45d6646.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lesodabat.epizy.com/9_regions_of_the_abdomen.pdfIn PDF document text
    • http://karababeso.rf.gd/metric_system_measurements_conversions_worksheet_answers.pdfIn PDF document text
    • http://warufadul.rf.gd/fish_names_and_pictures.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00026a5f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x26A5F 24496 bytes
SHA-256: 3919038c50f285d59161ad2223bec39000cf0748467c6c797df062bb64eb64cf
font_00_sfnt_off00022ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22EC9 5600 bytes
SHA-256: a99c077fe4756f44802e855cc7dd1c514cb322bdf62b8e50b88ee3fbc2539ca6
font_01_sfnt_off000241dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x241DD 11800 bytes
SHA-256: 56f7330e81520433b928d47160e808bbd7a5f8625a503f5cff86b056ca4c1607

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