Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c243a6a82e0dca…

MALICIOUS

PDF

85.3 KB Created: 2021-05-29 12:41:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5dc3dcb9e3c08298620851193c2ca591 SHA-1: ca4288b9c54a16bd332623fadec4009cd61a3025 SHA-256: c5c243a6a82e0dcaf32e63284de8fa85bc1b984e2f7b42f5bce2a4f23cf40607
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://fokemale.ru/strik?utm_term=how+much+does+anytime+fitness+cost+per+month+uk PDF link annotation
    • https://rurujopolobadez.weebly.com/uploads/1/3/4/4/134444805/60301.pdfIn PDF document text
    • https://vazoxavaver.weebly.com/uploads/1/3/4/8/134863882/1605160.pdfIn PDF document text
    • https://musazulawikale.weebly.com/uploads/1/3/5/3/135305526/kizodagubij-fisanovarubuxim-fudojepulerita.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368469/normal_5fea32b97cbde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462726/normal_6036d3ba6b785.pdfIn PDF document text
    • https://xerazagas.weebly.com/uploads/1/3/0/8/130813913/gikixovarobuku.pdfIn PDF document text
    • https://kivopovolufom.weebly.com/uploads/1/3/3/9/133997215/e478785ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496582/normal_60309274640b8.pdfIn PDF document text
    • https://vafeperaj.weebly.com/uploads/1/3/4/5/134586379/lonize-labijajudifube.pdfIn PDF document text
    • https://tedovuja.weebly.com/uploads/1/3/4/4/134465286/pifovig.pdfIn PDF document text
    • https://pakokapixufepu.weebly.com/uploads/1/3/4/6/134659136/wujori.pdfIn PDF document text
    • https://foxufaba.weebly.com/uploads/1/3/1/4/131482874/negibenukofavetazivi.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4448727/normal_60b1e5d8439b8.pdfIn PDF document text
    • https://satalediveli.weebly.com/uploads/1/3/4/0/134018026/d869c38901.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371509/normal_60376a2311da4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492278/normal_5fe2bbec0fabb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368770/normal_6056d4d74fbed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461207/normal_60484f7072515.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377115/normal_604d2c3c115c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422890/normal_60088aa0402c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481271/normal_5ff94c470b74e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/d381989d-144a-4f4a-9425-2eab1cda7c6b/wijejafut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99296d51-87cf-479b-85a7-762a8a1f210d/crossfire_volume_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd32cf9d-b419-4007-8641-e1f3876cc296/the_grand_grimoire_full_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8762cc4f-ab1a-4f1c-a437-6c8d5a70baaf/how_long_is_the_first_harry_potter_film.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7037cd47-f541-458f-90e6-89114a7cfa0a/gemedowabejib.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF18 5464 bytes
SHA-256: 7a1a6bc7b4625647b90f4c5b81d79ee2d743277891c08211aef6a41ebd1bb4a6
font_01_sfnt_off0001119d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119D 11164 bytes
SHA-256: c35d93820fb493168dbf4afeed2bb8fc33d66c7b55452990ea856a29671496f7
font_02_sfnt_off0001376b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1376B 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e