Malicious PDF — malware analysis report

Static analysis result for SHA-256 3398a2744abc04b4…

MALICIOUS

PDF

82.8 KB Created: 2021-03-22 23:28:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c1c9df9365efab7a8632ce71d4f70b65 SHA-1: dc536fea8ebe30fa130c499eb34bc6ec5ef6b8ff SHA-256: 3398a2744abc04b41b61e62de6897498d9e93330c55fa23f6d52ecea643ecc4e
126 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful websites.

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/123?utm_term=virtual+villagers+game+free++for+pc PDF link annotation
    • https://gisunada.weebly.com/uploads/1/3/1/4/131409009/b5ecb14bf3eb3ba.pdfIn PDF document text
    • https://cdn.sqhk.co/dewavasese/TojxidK/76858991248.pdfIn PDF document text
    • https://dalupapixoriwu.weebly.com/uploads/1/3/1/4/131438121/lexon.pdfIn PDF document text
    • http://sudazoraxo.22web.org/wavupesineduf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497370/normal_6022292252bb3.pdfIn PDF document text
    • https://cdn.sqhk.co/kevovevude/idEgcow/zazowu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369518/normal_6028b9cdbb493.pdfIn PDF document text
    • https://wopopodixela.weebly.com/uploads/1/3/0/9/130969383/tazeves_nubuvagizejol_vexupemi.pdfIn PDF document text
    • https://cdn.sqhk.co/gadewekunel/JXINtgj/20405630335.pdfIn PDF document text
    • https://cdn.sqhk.co/bexefoboxevi/HEjfgds/basketball_shot_chart_printable.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/lepefi/37102899295.pdfIn PDF document text
    • http://boparozib.rf.gd/how_much_does_a_director_earn_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/hd_background_designs_free.pdfIn PDF document text
    • http://zekuvosaletum.rf.gd/fujifilm_xp140_yellow_review.pdfIn PDF document text
    • http://xeravujowa.epizy.com/british_thyroid_association_ultrasound_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/le_secret_sheet_music.pdfIn PDF document text
    • http://benapubusepem.rf.gd/pamphlet_template_word.pdfIn PDF document text
    • http://tabunubefuxa.epizy.com/always_on_display_s9_plus_apk.pdfIn PDF document text
    • http://sojugixu.epizy.com/predator_4000_watt_generator_manual_precio.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_off00010531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10531 5360 bytes
SHA-256: 449afcdc481fa6bde80e0b5deb6745d0ee30a8cc7ef5b36a4b5075976b886a56
font_01_sfnt_off00011769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11769 11392 bytes
SHA-256: 4ff5e3ca8da0ab3620d610a315407481cb905166ba1f727be91cd78139b79f9e

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