Malicious PDF — malware analysis report

Static analysis result for SHA-256 c70918c935d4d823…

MALICIOUS

PDF

129.3 KB Created: 2021-04-02 07:27:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75e58a7da7a424fce8600db996b09f5e SHA-1: 42661b2224dba4948fb0040d6f7e4191de04c569 SHA-256: c70918c935d4d8231f58e888e5c03cf0c859c40e361a7fc0dca39e1fdb84e3aa
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to be a deceptive search result designed to drive traffic to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gimoguvi.ru/strik?utm_term=what+is+the+difference+between+orthodox+christian+and+baptist
    • http://dlkmvkoenv.info/28076855944950p5.pdf
    • http://esmoney.site/golebasalavewudenolinpe07.pdf
    • http://ig-soft-team.com/bedwars_hypixel_mappi378.pdf
    • http://evgeniy-semenenko.ru/769054986922x69d.pdf
    • http://mestikon.online/virobopesisesrclhb.pdf
    • http://lnstagram-office.com/a_world_of_ideas_10th_editionuf26h.pdf
    • http://top-agent.ru/directx_setup_errortvhrt.pdf
    • https://static.s123-cdn-static.com/uploads/4426424/normal_6007f343ed3aa.pdf
    • https://static.s123-cdn-static.com/uploads/4477913/normal_60044c5026e0a.pdf
    • https://cdn-cms.f-static.net/uploads/4421461/normal_603ba64eca49c.pdf
    • http://itnegozio.info/how_much_is_a_flip_phone_at_walmartohgt4.pdf
    • https://cdn-cms.f-static.net/uploads/4408873/normal_6014b693420a0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e46eb8ae-11b5-47af-91b5-79e2db369635.filesusr.com/ugd/f84671_efb42800d1e343259aff50eb274ca38e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/19846d58-50a5-41da-b043-0ebc9e74d63a/3003865354.pdf
    • https://uploads.strikinglycdn.com/files/777b1315-ab97-47ab-982c-838845b2ee9e/kilerunefurumunipobit.pdf
    • https://uploads.strikinglycdn.com/files/4fac1f7e-4581-43be-9bc5-8a586c6e80cc/31204705171.pdf
    • https://uploads.strikinglycdn.com/files/7e780954-4ab8-4f49-9c9b-5703fe624bb4/thermal_control_systems_automotive_tcfr.pdf
    • https://54570836-76ea-4100-b78f-d1ba4c3cc0d1.filesusr.com/ugd/21ac59_82ae09970f1c45b5803d19b20d4d4975.pdf?index=true
    • https://67d298e0-85f4-4ad4-bf36-e1ac857e42fc.filesusr.com/ugd/b6bf5b_cd3cd744edd44d4cb4bf95bad78f934a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f879cd5b-d11c-49c9-ba14-96eb2d45e181/1860760079.pdf
    • https://uploads.strikinglycdn.com/files/ae82dcb8-5232-4234-ab23-311f93f1a1c4/zuzokobij.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000182c8.bin
0b93444ca979a7cefe80629a226463ad9b1fe4c23545cbf7f41d7f44547abd11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x182C8 6480 bytes
font_01_sfnt_off00019909.bin
80193f42e8bf83784fac4c0b112c68f552712ec4c764f4d10700965a2aa80ee1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19909 5524 bytes
font_02_sfnt_off0001abe8.bin
493ea5bef5ed629cfdebd83f31e3e7b08cdd4d7df4f9812bf221117162c6f5e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABE8 17752 bytes
font_03_sfnt_off0001e105.bin
ba9b5293d46f42e597c092e757bf770b0226661663f119891d806c1875324a0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E105 16116 bytes

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