Malicious PDF — malware analysis report

Static analysis result for SHA-256 d392df36a276c0fa…

MALICIOUS

PDF

86.5 KB Created: 2021-04-01 17:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 85bf4f58f0cddf2c4c4468c8d5b9e1a0 SHA-1: b23d9c7848decc46ca0193b57ff01e99dbf4a749 SHA-256: d392df36a276c0fa6686d4a39fa646c6bb8855b5d12c358792efb4e9b2372981
206 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to external sites. Heuristics indicate a malformed exploit stream and ML classification strongly suggests maliciousness. The primary URL, 'https://jumiwimov.ru/wix?keyword=where+do+zaful+clothes+come+from', suggests a lure to a site that may be involved in phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://jumiwimov.ru/wix?keyword=where+do+zaful+clothes+come+from PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4498392/normal_5fdc32a8b562f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476927/normal_5fe930a7de445.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417408/normal_605f9eb24d185.pdfIn PDF document text
    • https://cdn.sqhk.co/govovazeket/gcigyeS/varomazekojuvo.pdfIn PDF document text
    • https://cdn.sqhk.co/pivugisaxap/iiihkgh/river_site_castle_wall_defense_in_siege_battlegrounds.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379380/normal_6013cbf374d53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449973/normal_60550998c4c3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366385/normal_603b7575c3e36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467589/normal_600f82de1bad7.pdfIn PDF document text
    • https://cdn.sqhk.co/juvanejejuwo/YgiLFg7/cheap_acrylic_nail_set_for_beginners.pdfIn PDF document text
    • https://cdn.sqhk.co/mapexovebo/hhXtEja/5196818466.pdfIn PDF document text
    • https://cdn.sqhk.co/vimewiki/gfijhid/83383852303.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420903/normal_5ff06a563c7ab.pdfIn PDF document text
    • https://cdn.sqhk.co/matijamaj/j32geIz/niwunupafexudegiwixas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nokatebikexu.epizy.com/21873688631.pdfIn PDF document text
    • https://b81e1767-bb0d-4562-9f98-cfef66859bb1.filesusr.com/ugd/b48b60_38cd970615bc4e8aabbec2063bbf6174.pdf?index=trueIn PDF document text
    • https://a95edb9d-21e5-46e4-bb1b-b1fdf66a5dae.filesusr.com/ugd/09e34a_651031f051624ab6b9b0658aadfad367.pdf?index=trueIn PDF document text
    • http://zorogeloma.epizy.com/ankhiyon_ke_jharokhon_se_movie_480p.pdfIn PDF document text
    • http://venewimo.rf.gd/navobusupufakafun.pdfIn PDF document text
    • https://b4140449-9b96-4148-8619-c9b3eed7b48c.filesusr.com/ugd/c33cdb_104e3da509184a74be6802241044e6c3.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_off00011580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11580 5324 bytes
SHA-256: 38866f0324206a1512e82ea10d9223ddefcc21d55e4e5b865e072b89e513b283
font_01_sfnt_off0001278a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278A 11036 bytes
SHA-256: 2373f3e8a9ac38d962429e16948c6a570365a42e4750d9c5ff120e731c686462

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