Malicious PDF — malware analysis report

Static analysis result for SHA-256 703ca079ba1bc0ff…

MALICIOUS

PDF

73.7 KB Created: 2021-05-13 10:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ceda6a1fbebccc983a34a74d716e76f7 SHA-1: 1f90da880562711c6f9b891a48fb457211296c63 SHA-256: 703ca079ba1bc0ff84d214fa962002d7b649a8dc37d0070ac16808f7bf29ed6a
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification strongly indicate malicious intent. The embedded URL 'https://mezovuduw.ru/strik?utm_term=neil+gaiman+neverwhere+series' is likely part of this malicious infrastructure.

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 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://mezovuduw.ru/strik?utm_term=neil+gaiman+neverwhere+series PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4414339/normal_6002c4b6f13df.pdfIn PDF document text
    • https://cdn.sqhk.co/jenireni/eiaFhdE/ninja_foodi_air_fryer_recipes_for_pork_chops.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477877/normal_6057dfd65acba.pdfIn PDF document text
    • https://cdn.sqhk.co/baxorurifina/heG6Thd/word_blitz_game_messenger.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469617/normal_5ff37e52a4d94.pdfIn PDF document text
    • https://cdn.sqhk.co/kupejabel/bwgegiz/tepumizutomagavowe.pdfIn PDF document text
    • https://cdn.sqhk.co/jojojidatun/4jfaGOh/neravuvi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444104/normal_6052a82c21eb9.pdfIn PDF document text
    • https://cdn.sqhk.co/netimupoxojo/cbyhcvP/jufulebefub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2cfcb734-ec62-4cd9-b61c-03d4762ad765.filesusr.com/ugd/a891c0_b3c18eaaeceb465b9d3ad3698fc9513c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c06bb2d3-bab6-4c72-8c3c-715280fc94ee/96850664550.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bc77a80-1188-4dba-82c8-932740e776b5/what_religion_is_your_bra.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/uniformly_distributed_load_bending_moment_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/3449420295.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bece2f9f-8455-4542-86ce-9b5dbf8c76d8/25106111133.pdfIn PDF document text
    • https://71b4061d-0fbe-47a8-a671-08758978b022.filesusr.com/ugd/0216f2_82885dda85d84d44afaaa23ff1ca222f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/df2c2762-49e7-4580-b0df-8ac5efba4369/kenitotadumos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7ba1606-003b-48fa-8d9c-786b57e390af/how_to_hard_reset_a_kindle_fire_7.pdfIn PDF document text
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_0117286336ca431383904303d806e425.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_off0000deca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECA 5220 bytes
SHA-256: 0effe6c04b955e8a4c6a40e2f24017ef401ec72a5c04f1d64b7b883d2849478a
font_01_sfnt_off0000f080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF080 12900 bytes
SHA-256: 232c795111ca9a315e266629cc2eb5aeef49e6d1886f6f358cd7a9aedb3001aa