Malicious PDF — malware analysis report

Static analysis result for SHA-256 09a92c9c4ed0305c…

MALICIOUS

PDF

77.8 KB Created: 2021-05-16 10:32:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b71c2e46cee8e059d18d9ed3817c2c6 SHA-1: 4d68a6f3f37f8cc48d7bbe66cdd4e06c3e8776e1 SHA-256: 09a92c9c4ed0305c8ac886f1daa9ea3e0381247429a5d8e25dbe39a8444a738e
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are to other PDF documents, suggesting a link farm or SEO spamming tactic. One of the primary external links points to a URL that appears to be a lure for downloading content. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/strik?utm_term=tom+sawyer+and+huckleberry+finn+full+movie+free+download
    • https://cdn-cms.f-static.net/uploads/4484370/normal_603ba6aaabe61.pdf
    • https://cdn-cms.f-static.net/uploads/4370077/normal_601baf075bb01.pdf
    • https://bupawajeba.weebly.com/uploads/1/3/5/9/135956748/tisudefof-lojafifajumexa-bawinomerarefep.pdf
    • https://static.s123-cdn-static.com/uploads/4453100/normal_5ff7cc9f9bbfa.pdf
    • https://cdn-cms.f-static.net/uploads/4454984/normal_604fc9d3375d9.pdf
    • https://xisuviwilizej.weebly.com/uploads/1/3/4/3/134320176/riferil_numamebudes_vewelefifosuwi.pdf
    • https://varudigenaka.weebly.com/uploads/1/3/4/5/134597471/paropuz_diwajale.pdf
    • https://kivepuwepadile.weebly.com/uploads/1/3/4/3/134392404/379f23f.pdf
    • https://betirowi.weebly.com/uploads/1/3/4/6/134661799/3a02e4e68218b5.pdf
    • https://wovupidej.weebly.com/uploads/1/3/4/6/134687137/remefimabunuge_meguno_vusojara.pdf
    • https://cdn-cms.f-static.net/uploads/4497370/normal_6021724b20566.pdf
    • https://jezulusawuse.weebly.com/uploads/1/3/4/0/134000263/91f8ef6242b32f.pdf
    • http://dogopanasukodum.22web.org/sessions_de_formation_traduction_en_anglais.pdf
    • https://jafusakivamo.weebly.com/uploads/1/3/0/7/130739280/7925237.pdf
    • https://kosukanawator.weebly.com/uploads/1/3/5/3/135304621/237a4a4b13.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2aea97b9-e600-42de-894d-79c4417a7cd7/what_are_the_benefits_of_corporal_punishment_in_schools.pdf
    • http://pizidera.rf.gd/52583818447.pdf
    • https://uploads.strikinglycdn.com/files/c9479955-0f75-4d31-a155-930031a00898/13868876052.pdf
    • https://uploads.strikinglycdn.com/files/1e33dd4f-1919-4e12-97b8-0cc5a9d050d1/31952808652.pdf
    • https://uploads.strikinglycdn.com/files/362dfcae-72eb-42ed-933b-c1f5c0ee46dd/navy_eval_bullets_for_e-3.pdf
    • https://uploads.strikinglycdn.com/files/ee32c36d-a0cf-410d-bc6b-924e81d5d746/fulupejejaxorop.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f09e.bin
67a062c377f8fe718fca66847cb305351c4368ef690dd01da765b9391ddae343		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF09E 5668 bytes
font_01_sfnt_off000103d7.bin
33efd9e345e42a7cdd5af4147b5cfd31dc163ab5b633e7d4f5b41b31061da6cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103D7 11000 bytes

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