Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d08af465314db37…

MALICIOUS

PDF

74.5 KB Created: 2021-03-24 22:26:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 81d78c809760725545e0e96d050b9fc5 SHA-1: f2d782b750e248e5a8bf71fd65fb2792e821e67a SHA-256: 1d08af465314db37dbc6ca2c8adfd57ee3e3e45a7280674c37785fc82aa9f6a8
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a phishing or SEO manipulation scheme. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness. While no scripts were explicitly extracted, the nature of the link farm and the detection names point towards malicious intent, likely related to phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://jacksth.ru/award?keyword=spinal+anaesthesia+pdf+download PDF link annotation
    • https://cdn.sqhk.co/zodavujera/ihOg4EN/rimi_linkmenu_g_parduotuves.pdfIn PDF document text
    • http://saniwofixapu.mygamesonline.org/ansys_cfd_post_user_guide.pdfIn PDF document text
    • http://blue-tick-central.com/gosebudadowexuvijiv24nrt.pdfIn PDF document text
    • http://hdvideo.design/86929571469j9kn3.pdfIn PDF document text
    • http://gufutaca1.xyz/45021594531zo2nr.pdfIn PDF document text
    • https://cdn.sqhk.co/mekurapiw/jcijSWU/silver_cloud_inn_bellevue_address.pdfIn PDF document text
    • http://pokupka.space/baby_trend_expedition_jogger_travel_system_wheel_replacementva0cd.pdfIn PDF document text
    • http://tihefers.online/77810700322fh1yl.pdfIn PDF document text
    • http://tonemisi.medianewsonline.com/bufapowufuzogakejojotul.pdfIn PDF document text
    • http://persequenteamsohbet.com/aditya_verma_teaserxldki.pdfIn PDF document text
    • https://bozuwosumexoxal.weebly.com/uploads/1/3/2/6/132682772/75390da596.pdfIn PDF document text
    • http://bumufirila.mygamesonline.org/19364824646.pdfIn PDF document text
    • https://cdn.sqhk.co/xunijejozi/phgu9LJ/38265645201.pdfIn PDF document text
    • https://nawawedivoxoni.weebly.com/uploads/1/3/4/7/134719505/333dbcc7.pdfIn PDF document text
    • http://studytogether.fun/mubitivajn251.pdfIn PDF document text
    • https://cdn.sqhk.co/letonolomo/dhyYge4/46737296709.pdfIn PDF document text
    • https://cdn.sqhk.co/rubupidorinu/cHnifax/27665723896.pdfIn PDF document text
    • https://zoradelageruwol.weebly.com/uploads/1/3/4/5/134591251/kitobonoki-kamitotobod.pdfIn PDF document text
    • http://musofiron.ru/62748858938si5ds.pdfIn PDF document text
    • https://nupariredarig.weebly.com/uploads/1/3/4/3/134357859/gomagowibaki-xavodidadeber-fixosira-zobevotob.pdfIn PDF document text
    • https://cdn.sqhk.co/zenekukera/dAibjck/90588047349.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_off0000e62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62C 5228 bytes
SHA-256: a643cefd89be068437c80cd0f3973e2b7c7fcdc6f06e8498893fbfe3da80b652
font_01_sfnt_off0000f806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF806 10336 bytes
SHA-256: 2c69d4b6fe7a6d8b440bc22192d9134b52fb0dd07d079df81a0291ff9c6562fe

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