Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7aed2222286aa2b…

MALICIOUS

PDF

70.3 KB Created: 2021-04-21 04:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a0b97efb1ac35b410f179c924588020d SHA-1: 042ec4479edd9e668ef4e74e2ca9ef1c6e9ec101 SHA-256: f7aed2222286aa2baa33df28227c51cb0591162cf856186ac9ee86751b4d5821
186 Risk Score

Malware Insights

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

This PDF sample was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous external URIs, with one specifically identified as a phishing lure. The document body is heavily obfuscated and appears to be generated content, likely intended to mask the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=jvc+mini+dv+camcorder+tapes PDF link annotation
    • http://zofokesagofot.22web.org/vikudivagajil.pdfIn PDF document text
    • http://sikuwolawotoja.22web.org/xowulibozu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://677e6977-fc43-48b2-ac81-16e478c8573b.filesusr.com/ugd/3750c2_11467976b7ae45ceb06e70a5d7e1628c.pdf?index=trueIn PDF document text
    • https://28ed73df-463f-41d7-bc87-4635118fd8e0.filesusr.com/ugd/74acc8_88b89f02c75d4202812d50867fee94d9.pdf?index=trueIn PDF document text
    • https://dd7ee03d-3646-4e01-a1e1-4c0a7e2c9e57.filesusr.com/ugd/d7ba0f_a6c76639441a423eb12f6f62302312ed.pdf?index=trueIn PDF document text
    • https://d8ec88ce-93b1-4b83-b294-7016fd5b5063.filesusr.com/ugd/366252_d234e34dd1844f0489a4efb1b6b19e0f.pdf?index=trueIn PDF document text
    • https://80ce5912-1c67-4773-adf4-abf614566e91.filesusr.com/ugd/acb48a_b5188451e42c414abc9d57ea8bb51359.pdf?index=trueIn PDF document text
    • https://07bd7893-a6ec-44d5-90fe-c719e602c0bd.filesusr.com/ugd/aafaff_96d73cbb82a443c9a0d3f88ea17868c6.pdf?index=trueIn PDF document text
    • https://dd67658a-cc17-4e1c-bca5-42bf299a485b.filesusr.com/ugd/07a440_f8c5d6e57199471a8482569c6fec1fb8.pdf?index=trueIn PDF document text
    • https://22520ec4-2132-45a5-98b8-54db1b71d3ea.filesusr.com/ugd/b33b96_93916a77cbe543b490f00663286d3ce5.pdf?index=trueIn PDF document text
    • https://def26600-86c9-4442-a738-094ddf2992d1.filesusr.com/ugd/eb5a6a_0da1f5556cbd4c6d8985bad8c3b62802.pdf?index=trueIn PDF document text
    • https://d2faa26e-66ca-44cd-8f84-883624a71019.filesusr.com/ugd/dbbfd0_813dbb4df7c9416f8bad694b4b1acedb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3bb0ecf-1943-4c42-a849-3a80ea41e878/how_to_know_if_your_throttle_position_sensor_is_bad.pdfIn PDF document text
    • https://b7e73dfe-ad35-4791-b4f7-7500f5b7882c.filesusr.com/ugd/bc79a4_71dd7b4b83614ce49fb4614b41f87f30.pdf?index=trueIn PDF document text
    • http://zupotid.epizy.com/couple_image_shayari.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcca2ca3-d606-4faa-9bd3-495839574af1/prisoner_b-3087_summary_chapter_6.pdfIn PDF document text
    • https://34570882-574e-4d25-8c0e-d8b9b6c2967f.filesusr.com/ugd/cb2bed_bb3c853fcfd04786826d3ab5fe4cdcda.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3d88be7-818f-4c07-98f4-89f092b26875/pezogexelitejotu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c1a3b52-5896-42a3-81bd-97088b8c8419/torelawufureduruwulutiwiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44e38152-8a17-4312-bbfd-57cf5b5e1fae/how_to_find_bond_angles.pdfIn PDF document text
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_28fc0695d75346debbb846730cb8dbcf.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_off0000d758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD758 5236 bytes
SHA-256: abcec1a81615c62ff516862ab233936e4afa1344ad0edb761f31370b1f6b9f18
font_01_sfnt_off0000e918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE918 10184 bytes
SHA-256: 31892e35a91d7ec8693ae1e49bd46453ae7ae08bc5adbf5d572901e92ea89946