Malicious PDF — malware analysis report

Static analysis result for SHA-256 31de04c41cd4ddfc…

MALICIOUS

PDF

75.0 KB Created: 2021-05-15 11:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0cf3004ea9d970883d5e11575684b294 SHA-1: b14a245a1bf59bb0622d1e6b6b22b24c2ca01fe5 SHA-256: 31de04c41cd4ddfcb08bbb998ea4d46bfe3d0fa9d62b1ca4fe8ab73162af08e6
186 Risk Score

Malware Insights

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

This PDF sample was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains a large number of external links, many hosted on disposable domains, characteristic of a link farm designed to redirect users to malicious content. The presence of embedded URLs and the PDF structure suggest it's intended to lure users into clicking through to potentially harmful sites.

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
  • 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://baarspo.ru/strik?utm_term=ps3+controller+on+pcsx2+1.4.0 PDF link annotation
    • http://mujoxoluvisukid.getenjoyment.net/biology_laboratory_experiments.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477137/normal_600398ecf2d24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373527/normal_60465cfb7e6d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380403/normal_60018ad8e115d.pdfIn PDF document text
    • http://jerimujolegem.medianewsonline.com/formalist_literary_criticism.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378378/normal_5feb9a2417e7b.pdfIn PDF document text
    • http://lenuvivureropi.scienceontheweb.net/why_wont_my_dvd_player_make_sound.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/3317cb47-588f-4428-880a-3aff3eac0faf/57601011297.pdfIn PDF document text
    • https://7c50ec62-1ece-451b-b03c-4788199016cf.filesusr.com/ugd/635f3c_df843bf38b9543f19d5026f11167bb81.pdf?index=trueIn PDF document text
    • https://170a7d3c-74f0-42f5-9ead-98ae292a4922.filesusr.com/ugd/a18aa6_a39fa4826299441d99ba1bb735b8701a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/228138b5-a673-4c5c-91de-762620b4724f/comptia_network_n10-006_study_guide_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c89fac0-c3f5-4d8f-87eb-42ae2d96d720/lotus_sutra_chant.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/897e7e1a-3af0-4870-ad0e-91d584686d6f/xifatu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a016d1c3-e39c-45a4-9373-d24197d1dff1/rufopiwovakadav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/739c074a-8de5-4ab7-a9eb-8a57412bbb2b/riropuxunasedenubabusigix.pdfIn PDF document text
    • https://57eba762-b826-4879-8d7a-7f480aba2934.filesusr.com/ugd/e89c2b_ea18e1fe90664b218a3bbd6e23c1a571.pdf?index=trueIn PDF document text
    • https://203aa715-7352-46b1-b16b-5d0aeeaa27a2.filesusr.com/ugd/0582e0_31bce7b7dcd1467393248731af9ea388.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8196826e-0cd3-4a35-911d-48ad3fdd4680/86537102686.pdfIn PDF document text
    • https://7e70056c-c2aa-4e53-98c5-50750123c107.filesusr.com/ugd/f8ae5d_cc879998c05542d78ecdde548ed66170.pdf?index=trueIn PDF document text
    • https://e6e31949-ba74-43ae-8e0c-2243355e89fd.filesusr.com/ugd/69e259_d8b28096b5f34111aaf0e24292722192.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_off0000e6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A9 5396 bytes
SHA-256: 1389f1f169d013de6e1f7917d27daa8acdd16cec153f4a643c0a45d705ea3d97
font_01_sfnt_off0000f92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92B 10528 bytes
SHA-256: b01db6ac0d142d7b2fb9edacc141723a39c954b1932e62000cc3532732f5df4c