Malicious PDF — malware analysis report

Static analysis result for SHA-256 7baac37d5f34fbc5…

MALICIOUS

PDF

96.5 KB Created: 2021-03-31 16:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 01b7ed3f6057b57795d776092c76ca88 SHA-1: c694a421e1a8d50adee26e9fd06299f6c074fbdd SHA-256: 7baac37d5f34fbc56828f29a1069d6bd53779d15f960f6264e8995c611820dce
186 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest an attempt to drive traffic to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://golowaki.ru/award?keyword=properties+of+squares+and+rectangles+worksheet+pdf PDF link annotation
    • https://cdn.sqhk.co/fojevimexu/h4pieJw/minecraft_diamond_sword_pictures_to_print.pdfIn PDF document text
    • https://cdn.sqhk.co/wewisadavoj/e6Vihhh/gixofewobudupaweje.pdfIn PDF document text
    • https://cdn.sqhk.co/votezevon/dZvOTih/ion_party_float_speaker_review.pdfIn PDF document text
    • http://vobarijijagurar.22web.org/vmware_64_bit_linux.pdfIn PDF document text
    • http://tusukezilineji.66ghz.com/reforming_catalyst_reaction.pdfIn PDF document text
    • https://sulogaxelope.weebly.com/uploads/1/3/1/4/131438888/fofepegonudefolexeve.pdfIn PDF document text
    • http://degadeg.22web.org/32688662889.pdfIn PDF document text
    • https://cdn.sqhk.co/rudixika/dijhejg/61892333174.pdfIn PDF document text
    • https://tikofasej.weebly.com/uploads/1/3/4/6/134615027/1353019.pdfIn PDF document text
    • http://dilurijarejo.22web.org/dozifesobuvimugoditik.pdfIn PDF document text
    • https://pivozedotafi.weebly.com/uploads/1/3/1/0/131070355/kemarexupozedi.pdfIn PDF document text
    • https://kuvanipugeva.weebly.com/uploads/1/3/4/4/134445248/wanesixuzoj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4fe85328-8dbf-40e9-afa8-2c8d6ff8a9c8.filesusr.com/ugd/9c0842_323a01e329354d429c7d3d257a0fe790.pdf?index=trueIn PDF document text
    • https://e53c8fcc-339b-4d8f-83f6-44ddc8c6ace4.filesusr.com/ugd/1ea9c4_19f3d1164b8a473a8a637445f592cf09.pdf?index=trueIn PDF document text
    • https://a80c0318-1640-4d50-a016-df037fc402b9.filesusr.com/ugd/895bef_b7f4b50c8c654c1b9121477518de2ea5.pdf?index=trueIn PDF document text
    • https://0dc5fd1c-b354-4e5b-9ccd-45395e8994ed.filesusr.com/ugd/f79e8d_37a123d902594472821a4c8a419aa147.pdf?index=trueIn PDF document text
    • https://8860adff-7f0b-4cf3-a358-cdd560dff136.filesusr.com/ugd/625844_454e74eb59044f58ac0ba84165d7661b.pdf?index=trueIn PDF document text
    • http://tetuzufolotozop.epizy.com/millennials_definicion.pdfIn PDF document text
    • https://5efcf519-4c71-4be9-a00f-e1d47ba804c5.filesusr.com/ugd/ebcc4b_97fb149ba1a2408caacf22be28849c82.pdf?index=trueIn PDF document text
    • https://9d50af6f-dbf7-41ba-b854-83985329a12b.filesusr.com/ugd/33c377_8de5d59541c848a29ae06f95c46a21f2.pdf?index=trueIn PDF document text
    • https://064d663d-f6b2-44cf-a6ad-083da5f315e5.filesusr.com/ugd/77eba6_e64c41705f834a468e8f2a3022f5a7d0.pdf?index=trueIn PDF document text
    • https://7e6b698e-d56f-4a21-8c48-787e2f6d39f4.filesusr.com/ugd/7836c9_a2cb730f5b9a4a10a4f6877af1654b64.pdf?index=trueIn PDF document text
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_5fc7f827643b42c19b0e9d6a681cb0c6.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_off0001397c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1397C 5700 bytes
SHA-256: e170f2a35d997cc56176e076d19112615ef0aeb32506de47bf9ef69527aa6be4
font_01_sfnt_off00014ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CED 11448 bytes
SHA-256: cb20b5b6e7c84c595c9c738f44f7f442de8f5097a50eb671a7642008e87b3186

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