Malicious PDF — malware analysis report

Static analysis result for SHA-256 c390284b5d25fe53…

MALICIOUS

PDF

81.1 KB Created: 2021-02-26 11:20:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 111f8c6c7ff1684e7f971a8322c40496 SHA-1: 0320156d5958ea83c2ec0ce8ce83a3d8a506d916 SHA-256: c390284b5d25fe538abe650d01f52f135343fba25eedaa6654da143ef28aa35d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary one pointing to a suspicious domain that appears to be a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated, but the presence of URLs and the heuristic findings suggest the file's purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/strik?utm_term=what+is+the+social+function+of+narrative+text+brainly PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4419857/normal_5fcf600707b17.pdfIn PDF document text
    • http://bilabugova.iblogger.org/besixojelaxanuwuloj.pdfIn PDF document text
    • http://zumigiguba.22web.org/witeromur.pdfIn PDF document text
    • https://kukegogefip.weebly.com/uploads/1/3/2/6/132681459/77ee52d4381d82d.pdfIn PDF document text
    • http://murunabo.iblogger.org/51383703256.pdfIn PDF document text
    • http://fepotarugagi.22web.org/2018_new_bodo_video_3gp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458404/normal_601f435715ad0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409413/normal_5fe0bd75e9c1a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://veguvegonuz.rf.gd/how_to_crossplay_r6.pdfIn PDF document text
    • http://gajovab.epizy.com/98784714170.pdfIn PDF document text
    • http://guvamimifufirar.rf.gd/38808825425.pdfIn PDF document text
    • https://s3.amazonaws.com/sezewu/apple_store_games.pdfIn PDF document text
    • http://todosix.epizy.com/37719990382.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_off00010017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10017 5352 bytes
SHA-256: aa756c65028435d50006b8e025add4cc1c9ea5a42c80ec4bd559e77a778e0853
font_01_sfnt_off00011263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11263 10836 bytes
SHA-256: 85805af8cf3bd0a057b34ae3e4d42a947c640c2bc4ab7fac4190369bbd1ba65b

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