Malicious PDF — malware analysis report

Static analysis result for SHA-256 39400a96e665efa8…

MALICIOUS

PDF

77.8 KB Created: 2021-03-01 17:49:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 7f07f2a860aebb19da0eaf9816e0a3cf SHA-1: 304fdad961eb1beec616742d17171482718719f0 SHA-256: 39400a96e665efa8d1aa8e5702c001a0abdb899af54c86a57ef21a5e95b892fe
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URLs, many of which are hosted on disposable domains or link farms, suggesting an attempt to redirect users to malicious content. The presence of a 'download' button lure further supports the phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=fifty+shades+darker+full+movie+download+in+dual+audio PDF link annotation
    • https://cdn.sqhk.co/baluwofuk/LXuPPif/weather_live_app.pdfIn PDF document text
    • https://pazunorafozide.weebly.com/uploads/1/3/0/7/130776571/pilurenupazis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416919/normal_600ca94d230f0.pdfIn PDF document text
    • https://wudajelenap.weebly.com/uploads/1/3/4/4/134470879/govimol_xakizekexim_derowin_bitujavebovapow.pdfIn PDF document text
    • https://dakikizubebara.weebly.com/uploads/1/3/4/8/134889455/xezikavuzekeno.pdfIn PDF document text
    • http://zekaxezixil.medianewsonline.com/how_to_avoid_dizziness_on_a_plane.pdfIn PDF document text
    • http://pasikufopubiwo.mypressonline.com/40792783569.pdfIn PDF document text
    • http://bewewafip.scienceontheweb.net/duzixabaxalamifemexobenof.pdfIn PDF document text
    • https://cdn.sqhk.co/ributexovek/jjbB4ha/ice_hockey_english_league.pdfIn PDF document text
    • https://cdn.sqhk.co/gukugifixija/Ch2kheY/nike_air_force_1_white_original_vs_fake.pdfIn PDF document text
    • http://kemamibuke.mygamesonline.org/35071793460.pdfIn PDF document text
    • https://gupijevud.weebly.com/uploads/1/3/1/4/131407369/4159736.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487424/normal_5ff540d346480.pdfIn PDF document text
    • https://kajuzenutojaso.weebly.com/uploads/1/3/4/6/134631714/c2018.pdfIn PDF document text
    • https://pugiputofal.weebly.com/uploads/1/3/4/7/134740318/sexazerejelasufasa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489852/normal_60065d24250c0.pdfIn PDF document text
    • https://famalekirujapa.weebly.com/uploads/1/3/1/4/131453917/jokedirijufafetiledo.pdfIn PDF document text
    • https://tugojomabam.weebly.com/uploads/1/3/4/5/134588125/a2a3cc8dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380695/normal_5fcf49bc0e4c8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF057 5420 bytes
SHA-256: 40c93babdfb26f25494306753308da7e2ee72fb25ff918385b287fa0271765a7
font_01_sfnt_off000102ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BA 11376 bytes
SHA-256: 7b3f76268d4b46563c80e3385c4653621c2158f637dafad1740165bd8d5a822a

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