Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a005c31b23d5b5a…

MALICIOUS

PDF

78.7 KB Created: 2021-05-29 06:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a35ecc974ca396e489a28d9750a3cd5 SHA-1: b9db311fcd0b19fae5398317c0bc5be65f67a977 SHA-256: 8a005c31b23d5b5a84bc5d8005f59fafc38e274e6e8f36662f8f7543562b4b68
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms and phishing. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to drive traffic to malicious sites. The presence of a URL pointing to 'seumenha.ru' with a query parameter related to 'hungry shark apk mod' further supports the lure of potentially unwanted or malicious software. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=hungry+shark+apk+mod+5+7+0.0
    • https://ketodoligas.weebly.com/uploads/1/3/4/3/134384615/8f2d091d488d.pdf
    • https://static.s123-cdn-static-d.com/uploads/4422161/normal_60aff040bae18.pdf
    • https://cdn-cms.f-static.net/uploads/4494883/normal_5fdb3de9ee535.pdf
    • https://static.s123-cdn-static.com/uploads/4386842/normal_5fef6817a0956.pdf
    • https://putigored.weebly.com/uploads/1/3/0/7/130738503/vijewuja.pdf
    • https://cdn-cms.f-static.net/uploads/4390328/normal_5fd0b8ea590d4.pdf
    • https://cdn-cms.f-static.net/uploads/4374380/normal_604105b385d06.pdf
    • https://cdn-cms.f-static.net/uploads/4472501/normal_602c3db0d404f.pdf
    • https://xomunulozesini.weebly.com/uploads/1/3/4/0/134018183/nifima_xoveje_miwipapovowevez_jumaxadex.pdf
    • https://cdn-cms.f-static.net/uploads/4390643/normal_604777979a669.pdf
    • https://cdn-cms.f-static.net/uploads/4409114/normal_5fd64400e8c68.pdf
    • https://cdn-cms.f-static.net/uploads/4388626/normal_602c21064f216.pdf
    • https://domenotupeloli.weebly.com/uploads/1/3/4/6/134685365/gavoxatixat.pdf
    • https://cdn-cms.f-static.net/uploads/4411480/normal_60671e86d3c40.pdf
    • https://cdn-cms.f-static.net/uploads/4386849/normal_606e30f70ef97.pdf
    • https://cdn-cms.f-static.net/uploads/4480758/normal_601359cfcbca2.pdf
    • https://cdn-cms.f-static.net/uploads/4421780/normal_6019f133342b5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/343596ad-1178-4c76-bb1f-957311e41322/3312886164.pdf
    • https://uploads.strikinglycdn.com/files/0297073a-b371-4664-950c-25cbfd20afdb/52218173939.pdf
    • https://uploads.strikinglycdn.com/files/80208d36-2a3e-40eb-8ab1-bbfe66e393fd/does_roku_2_support_disney_plus.pdf
    • https://uploads.strikinglycdn.com/files/f1db367f-978d-43e1-a925-e001c9d6ccb4/funakinakisoxag.pdf
    • https://uploads.strikinglycdn.com/files/26f541c7-07ae-441f-a7ed-67ce79534568/40726325741.pdf
    • https://uploads.strikinglycdn.com/files/3b601fc9-680a-4e64-9586-5f0d551caef3/the_book_of_noah_free_download.pdf
    • https://uploads.strikinglycdn.com/files/2996b0a9-d95b-430a-813e-a4e68e8693c2/vanirutibetudilifinemigoj.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_off0000ef30.bin
05378040cbe553c8d5e1d3040eaf86e7e996b902fe1ee8db604b92afe991a991
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF30 5848 bytes
font_01_sfnt_off0001030a.bin
44e450ffcc51cc7d2d8d7a74f0842a6b5b4137a5fb91b26f848c00098b563f14
pdf-font-stream PDF embedded font (sfnt) at offset 0x1030A 11860 bytes