Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7d863905991fbc8…

MALICIOUS

PDF

72.6 KB Created: 2021-01-20 16:10:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 1a6affc246ae89d49a8f0e59e2d66a06 SHA-1: 95de58bdce056246dd656a9e3474be31c9fb4a72 SHA-256: e7d863905991fbc83f32281a8ffbf809726511abe1553e3202666b96a41f34fd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm designed to redirect users to external sites, with one URL specifically appearing to be a lure for 'food web questions answer key'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

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://bologen.ru/123?utm_term=food+web+questions+answer+key PDF link annotation
    • http://dunetetemob.22web.org/18998034156.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459805/normal_5fb4061dacd2c.pdfIn PDF document text
    • https://site-1172900.mozfiles.com/files/1172900/pinball_eggs_free_game_3d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489032/normal_5fc8608ee9f3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402533/normal_5f9476e491111.pdfIn PDF document text
    • https://site-1247386.mozfiles.com/files/1247386/lulotawo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374954/normal_5fe92aa526a64.pdfIn PDF document text
    • https://site-1175392.mozfiles.com/files/1175392/worst_game_ever_unblocked.pdfIn PDF document text
    • https://site-1177018.mozfiles.com/files/1177018/wepomowiv.pdfIn PDF document text
    • http://gikilebi.iblogger.org/android_drawable_bitmap_resize.pdfIn PDF document text
    • https://site-1176370.mozfiles.com/files/1176370/fender_57_bandmaster_manual.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/wizuluworafid/canon_pixma_ip100_instruction_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/fema_ics_100_c_answers_2018.pdfIn PDF document text
    • http://bagineju.epizy.com/84929952515.pdfIn PDF document text
    • http://wokezafuvix.epizy.com/fuzimikuwijevexuputezaw.pdfIn PDF document text
    • http://vugikalijuboxo.epizy.com/87119224387.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_off0000de62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE62 5264 bytes
SHA-256: 8459224a1b672f33233482ea4f4cfea14c3d2c32ad8844dd4b8515bdd2640284
font_01_sfnt_off0000f06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06F 10824 bytes
SHA-256: 40dc24b79cff9d8b769971dfd4a46a4637526e6474d9dd6b28cdc9205c100bb6

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