Malicious PDF — malware analysis report

Static analysis result for SHA-256 b76bc19c7b4eaeb1…

MALICIOUS

PDF

82.7 KB Created: 2021-03-20 20:53:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1dd21ab545519838ed693156ad592702 SHA-1: 24107b0832501bcdb665585fbf90be059d0ecb5b SHA-256: b76bc19c7b4eaeb12f0d268de114206fb5008fcb5a021f8aede1e2e7faf99aa9
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the presence of numerous external URLs is the primary indicator of malicious activity.

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://druttle.ru/123?utm_term=angular+templateref+in+service PDF link annotation
    • https://bopamoverera.weebly.com/uploads/1/3/1/4/131408256/wepudimosux.pdfIn PDF document text
    • https://revikavebizuxev.weebly.com/uploads/1/3/4/3/134383550/8002912.pdfIn PDF document text
    • http://bathforlegs.xyz/kuzozikafibedugozudtji8p.pdfIn PDF document text
    • https://barijimuje.weebly.com/uploads/1/3/1/4/131406344/b48243e45fb.pdfIn PDF document text
    • http://filfex.ru/27822712868ezyms.pdfIn PDF document text
    • https://juwomazitebuden.weebly.com/uploads/1/3/1/4/131414743/13be997b79.pdfIn PDF document text
    • https://bovabesizepin.weebly.com/uploads/1/3/1/3/131383515/gimatoz-lunigu.pdfIn PDF document text
    • https://tivepikilusu.weebly.com/uploads/1/3/4/7/134759048/kojopebaze.pdfIn PDF document text
    • https://xoxigukot.weebly.com/uploads/1/3/4/8/134861038/tofotibesapuve.pdfIn PDF document text
    • http://healthit.space/rawadesowinisuginovodejonr9fy.pdfIn PDF document text
    • http://help-copyrightservice.xyz/tavujuvefeniwoxuzoczh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bofake/4488146649.pdfIn PDF document text
    • https://be9ca920-c372-4566-b00d-544f92814f3b.filesusr.com/ugd/f0c5a9_0829cb77ac4c480eba90a7b0fb7d58f3.pdf?index=trueIn PDF document text
    • https://e510c2d5-567e-4a96-89ff-abc18316baf7.filesusr.com/ugd/8a9bcc_83fa84bd9c2149bc935102f2cf55ac1b.pdf?index=trueIn PDF document text
    • https://1864c106-1a4f-4194-99fb-dabd5a0af450.filesusr.com/ugd/17b194_bde2346061d9432c84bd3856c2486373.pdf?index=trueIn PDF document text
    • https://7322f44d-5cb7-45f5-8521-a79093f6ce74.filesusr.com/ugd/dd0890_d8049978eb5548bd89fa437449a68205.pdf?index=trueIn PDF document text
    • https://b64dd490-e5b9-492f-89ff-e398ecee904c.filesusr.com/ugd/5926b4_7a80b03bc3e84fc6924e8cf64dafcb93.pdf?index=trueIn PDF document text
    • https://2a082fd4-e93f-4b8e-9e59-408fa046b31c.filesusr.com/ugd/e334dd_d9fd86fcc7a545f1b25a20cd8506f5f5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/53171508550.pdfIn PDF document text
    • https://8f1c0ae7-1ba6-4c51-a623-4d29f5e3aebb.filesusr.com/ugd/c1615c_a9d8a0a20b064f7b829c10e6d7d6db55.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF945 2912 bytes
SHA-256: b3177c8de935bf2e05ba58035bb430970af2c83108b60a2dfb12b0772094c699
font_01_sfnt_off000103a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A0 5384 bytes
SHA-256: 7037243a21c78275eb9258b3365de8eba1e8f3c8ca64c3cb9206b54d7ee7b31e
font_02_sfnt_off000115ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EE 11512 bytes
SHA-256: 1582002f94d8a0c17a2c4be022cf16af53478e2fda2e6969c267e4e1589136cd

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