Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfb4476d711f8f74…

MALICIOUS

PDF

66.9 KB Created: 2021-03-04 04:12:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f1074f74eb21610b1cc018c5deeb9b9f SHA-1: e80eabdfb4bf426c8fc48d97ad8139943cb59999 SHA-256: bfb4476d711f8f7451bd14465b2424bd061214632b28096855080d184cf38992
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged as a link farm. This suggests the document's primary purpose is to redirect users to potentially harmful websites, likely for phishing or malware delivery.

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/strik?utm_term=brother+p+touch+pt+1290 PDF link annotation
    • https://wabelurotetef.weebly.com/uploads/1/3/4/6/134693048/bizizepanerinurop.pdfIn PDF document text
    • http://otomail.business/c._g_song_video_3gprxtui.pdfIn PDF document text
    • http://3bki.ru/xofiwefavorajoxumawabifhe9q.pdfIn PDF document text
    • https://xudomulur.weebly.com/uploads/1/3/4/0/134040538/nazafaro.pdfIn PDF document text
    • https://vubeluzuge.weebly.com/uploads/1/3/4/3/134357782/8569163.pdfIn PDF document text
    • http://apparentlyopt.com/fifty_shades_of_grey_soundtrack_lyrics_greekwdlq6.pdfIn PDF document text
    • http://kaxavetaxudu.mywebcommunity.org/45403912733.pdfIn PDF document text
    • http://profit-makers.club/petsafe_replacement_collar_for_wireless_fence4fix2.pdfIn PDF document text
    • http://vuvuga.xyz/how_do_you_determine_if_a_stock_is_a_good_buysx82v.pdfIn PDF document text
    • http://tufodudem.mypressonline.com/how_to_study_sanskrit_class_9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://juvokumepi.rf.gd/sazepixugitetoxuxabe.pdfIn PDF document text
    • http://vedidutumi.rf.gd/marriage_annulment_forms_virginia.pdfIn PDF document text
    • http://jezevenakos.myartsonline.com/mexaponiwikapubabu.pdfIn PDF document text
    • http://mumidukegex.rf.gd/one_piece_bounty_rush_apk_obb_revdl.pdfIn PDF document text
    • http://pajogapusifured.rf.gd/communist_manifesto_hindi.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_off0000c8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DF 5132 bytes
SHA-256: 4aff4f0bbe31680adb369690ce717d5afd827f89b2b3bb21e16777c07063a86b
font_01_sfnt_off0000da62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA62 10768 bytes
SHA-256: 0c8eca6c98f5f1a7d2269582a11c356f99ea2a8661bb536a472dcdfa620b42e0

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