Malicious PDF — malware analysis report

Static analysis result for SHA-256 f622c6718dfd88a1…

MALICIOUS

PDF

81.7 KB Created: 2021-03-28 12:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f8c39915c65dd3cf7ba9e1142316ff07 SHA-1: ee684695c31005228f7e34405211ad6634cdf34e SHA-256: f622c6718dfd88a1b31e5ef77ad12c58b91c9c1037534de8e85af27c3950c586
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which point to disposable hosting, suggesting a link farm or phishing operation. The embedded URL `https://kuzutuzo.ru/strik?utm_term=free+one+page+nonprofit+business+plan+template` is likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://kuzutuzo.ru/strik?utm_term=free+one+page+nonprofit+business+plan+template PDF link annotation
    • https://kuwiliwal.weebly.com/uploads/1/3/1/3/131378779/nezenomopejajuro.pdfIn PDF document text
    • https://titumakusijuvap.weebly.com/uploads/1/3/4/3/134353199/sojapodavav.pdfIn PDF document text
    • https://gikoberi.weebly.com/uploads/1/3/0/9/130969260/popok.pdfIn PDF document text
    • http://6gusevshop.website/cracked_apk_apps_freehhpbl.pdfIn PDF document text
    • https://lalupapetawosi.weebly.com/uploads/1/3/2/8/132816164/giwuxixili.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422897/normal_60094551e9fbf.pdfIn PDF document text
    • https://lilafigofuku.weebly.com/uploads/1/3/1/3/131398347/073a63b704ef9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375197/normal_6025a69279efd.pdfIn PDF document text
    • http://kartaidatodemeleri.com/28964308603v66xi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377909/normal_60279ab9bc56a.pdfIn PDF document text
    • https://nubugudapo.weebly.com/uploads/1/3/2/8/132814946/75e531e.pdfIn PDF document text
    • http://granitmetrospecstroy.ru/812849634k1tov.pdfIn PDF document text
    • http://pitushok.space/staff_of_serapis_read_online1r5v1.pdfIn PDF document text
    • http://pro-konditer.com/48131928977iutio.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406191/normal_60138a8aade2b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383792/normal_5ffb94088cf67.pdfIn PDF document text
    • https://rizaguvaza.weebly.com/uploads/1/3/4/5/134502188/ditutupozij-pudun-xolibubok-wudewotudazog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/motorola_ce0168_model_name.pdfIn PDF document text
    • https://2ffa788b-df2f-461f-b9c5-573bec542745.filesusr.com/ugd/374ce0_8ad709317d6d40958e806ed4f9cdb647.pdf?index=trueIn PDF document text
    • https://e9155d39-0f7d-4366-9ee8-34e17fe3d773.filesusr.com/ugd/9e05b8_24d0c0dcdec94937b6a98edf195e5de0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/37341006096.pdfIn PDF document text
    • https://b615eccc-4413-4b1d-8109-ede925130a83.filesusr.com/ugd/0994f9_6ceb6cb159064c92b587490c336b453c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/avaya_partner_acs_caller_id.pdfIn PDF document text
    • https://7f2467c6-0d80-4e38-8df7-27624e0b9669.filesusr.com/ugd/e19533_af38d74d3553410eb3925798eccfcef7.pdf?index=trueIn PDF document text
    • https://2c0370cf-43ec-4dc9-8589-ec1e7793a70d.filesusr.com/ugd/404058_cecfe57dece440ad8dfd2e95dd1bfe10.pdf?index=trueIn 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_off000101df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DF 5316 bytes
SHA-256: f05be7c7f3f3a9ac16fc2cf4c68b185164010db99a17d57627e799aeb3fa36d8
font_01_sfnt_off000113e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E2 10688 bytes
SHA-256: 3a060c58cdc62211bb3aec7b182f06b0d9cb4d1728056f0725376efb1167266d