Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdbf54e1500ddc9d…

MALICIOUS

PDF

90.2 KB Created: 2021-05-31 14:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a1a98a62a5bb6877bce4f0685769b352 SHA-1: ecf042c39e8ccf08e5bccb85574924d72d854888 SHA-256: bdbf54e1500ddc9dd68827b01901224c1cb955759c54a6759f4073d4bf59f21e
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically pointing to known malicious redirector infrastructure. This suggests the document is part of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection further support its malicious nature.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/123?utm_term=bestandteile+eines+computers+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4444643/normal_5ffc4aceb1ba3.pdfIn PDF document text
    • https://luzodogapop.weebly.com/uploads/1/3/4/2/134265842/7049903.pdfIn PDF document text
    • https://zokagagewawo.weebly.com/uploads/1/3/4/3/134346606/fuwopuzavow_sewexadawageti_xojilixijawoxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409250/normal_605fd719d8189.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375083/normal_603811a2533fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386851/normal_6003f2ea88135.pdfIn PDF document text
    • https://ziperivowupidu.weebly.com/uploads/1/3/1/3/131381589/683ae5.pdfIn PDF document text
    • https://sutudaxete.weebly.com/uploads/1/3/4/4/134497902/ef654512229.pdfIn PDF document text
    • https://mosatidopo.weebly.com/uploads/1/3/4/7/134731439/57091ccdfa35.pdfIn PDF document text
    • https://senuwisaf.weebly.com/uploads/1/3/4/0/134018119/sibobuzozabax.pdfIn PDF document text
    • https://wonidajubiput.weebly.com/uploads/1/3/4/0/134017859/zakikagokolemuwe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488807/normal_6044f39e23dde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470380/normal_6015ed2f3b721.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428342/normal_5fdb5fd797443.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/158c6376-630e-4719-89ed-349387d85a03/nugegunidutagufoxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d7a36fb-cc8d-4a6c-a514-1754cf87f041/sutojo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c389bfd-19eb-46b1-ba8d-88d0b38f4173/cannot_find_my_passport_ultra_on_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a57e172c-bc7c-4cb5-a19b-7461582a08cf/33071407778.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23aa1d2d-c775-441f-b4ca-320ad5b59069/84928399530.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/799b5c90-5223-4206-9b00-004584bd4bd2/gogefijemajawoxesitapuloj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/478de11f-2ac5-4b8b-b5b0-c0c36a5fd348/what_does_thermal_insulation_mean_in_science.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_off00012006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12006 5348 bytes
SHA-256: 62aea7b98885f37a6ce6a4aa2513e4b103928c03b77655f615eaa0c2ded94d6e
font_01_sfnt_off00013220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13220 12664 bytes
SHA-256: ae26e2a99bea139a973905ea1e5d8c7a17cd65dd8e6a240b57fcf135efe8753d