Malicious PDF — malware analysis report

Static analysis result for SHA-256 444f3376955cdd4e…

MALICIOUS

PDF

73.9 KB Created: 2021-05-13 21:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a8c02198f305128c51c626220eebcb0f SHA-1: 78294f2de7559a384143fcdfca3a390fce1a9588 SHA-256: 444f3376955cdd4e278215e69c9f563840d2c81d18cfab166aa52c24c3f0c105
226 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The document body, though heavily obfuscated, contains text related to search queries, suggesting a lure to drive traffic to these malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://jottigo.ru/strik?utm_term=what+is+the+remote+control+code+for+a+samsung+tv PDF link annotation
    • https://litaduzava.weebly.com/uploads/1/3/4/4/134499200/a1f770f80a981e.pdfIn PDF document text
    • https://cdn.sqhk.co/rojisixel/gihdgiJ/43733664652.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462352/normal_5fcb300d00d25.pdfIn PDF document text
    • https://rusuligoxajikug.weebly.com/uploads/1/3/4/3/134399392/bonosizoju.pdfIn PDF document text
    • https://cdn.sqhk.co/gujipiror/jcBVUm7/traffic_rider_2020_apk.pdfIn PDF document text
    • https://xitagagumirowe.weebly.com/uploads/1/3/4/3/134346856/malegilovonu.pdfIn PDF document text
    • https://cdn.sqhk.co/ronelejibir/gfhhhhT/canva_graphic_design_video_collage_logo_maker.pdfIn PDF document text
    • https://rosatavur.weebly.com/uploads/1/3/2/6/132695818/3b36bd5fd9a7.pdfIn PDF document text
    • https://bokoxopeke.weebly.com/uploads/1/3/4/2/134266118/mozuxomaf_nuzetofepagavu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484631/normal_600f80f640c54.pdfIn PDF document text
    • https://nifisutabunus.weebly.com/uploads/1/3/4/6/134634245/013875715635d1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480579/normal_5fe70a8e2f8ac.pdfIn PDF document text
    • https://jatilupek.weebly.com/uploads/1/3/4/4/134491857/3657290.pdfIn PDF document text
    • https://lasasokuvob.weebly.com/uploads/1/3/1/6/131607269/bufitigifinupabuz.pdfIn PDF document text
    • http://lnstagram-support.live/super_dancer_chapter_3_contestants_eliminatedxysa1.pdfIn PDF document text
    • http://retys.fun/radical_forgiveness_worksheet_instructionshdwc3.pdfIn PDF document text
    • http://nudistoff.club/how_to_turn_down_volume_on_adt_safewatch_pro_3000eaqxz.pdfIn PDF document text
    • http://br1.red/verakelw9eep.pdfIn PDF document text
    • http://polikarmonolit.ru/how_do_you_play_the_game_liars_dicecxhx2.pdfIn PDF document text
    • http://itayoga.space/numerologa_angelicalahjnt.pdfIn PDF document text
    • http://yewes.space/a_different_mirror_a_history_of_multicultural_america_downloadayosr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451544/normal_6023a1591d02e.pdfIn PDF document text
    • https://cdn.sqhk.co/tusadopovet/jeDpjij/rave_video_with_friends_app.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53E 5392 bytes
SHA-256: bb0ccd9a4b9d1dd79b202a9fafb772ff323e655db7c2da40da2c43fa681f0d8f
font_01_sfnt_off0000e779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE779 10572 bytes
SHA-256: 631a661332e5556f66e759b4e83df28b0ed6f79b5d4b602c9e633d1c0d044629
font_02_sfnt_off00010b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9A 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3