Malicious PDF — malware analysis report

Static analysis result for SHA-256 7732b10794a1e142…

MALICIOUS

PDF

77.7 KB Created: 2021-03-20 19:04:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 187906dd266c77587b653f6cefd5c564 SHA-1: 27c907c2834047e3db887691679762307fcd74b6 SHA-256: 7732b10794a1e142b8bbe8ffa75cd55c9bd07d0b89b53b085a8df183c39fb89b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The primary URL observed, 'https://gimoguvi.ru/award?keyword=anemia+hemolitica+en+perros+pdf', is likely part of this scheme. The document's structure and content indicate it's designed to redirect users to potentially harmful or misleading websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://gimoguvi.ru/award?keyword=anemia+hemolitica+en+perros+pdf PDF link annotation
    • https://xanerenidijuv.weebly.com/uploads/1/3/0/7/130739333/5084386.pdfIn PDF document text
    • https://cdn.sqhk.co/molivovuki/jdjjihd/jovorejuli.pdfIn PDF document text
    • https://lonokowikur.weebly.com/uploads/1/3/5/3/135384913/2487985.pdfIn PDF document text
    • https://rotarivinevi.weebly.com/uploads/1/3/4/5/134599250/9bd6b219dfcd.pdfIn PDF document text
    • https://cdn.sqhk.co/titabofasika/cijidgf/bass_music_player_app_download.pdfIn PDF document text
    • https://gimituwemowi.weebly.com/uploads/1/3/4/8/134872285/zinimogezenunefaju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2ad55d82-15d9-4995-b72c-f03dca93b5f4.filesusr.com/ugd/11b7eb_259f12f30e754ba09e23a62be772eb76.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc454ba0-4be7-4035-b5ea-9e56935e16cd/weighted_blanket_with_zip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88964915-09a6-4ad6-a8e6-f91a07be9a0a/xotit.pdfIn PDF document text
    • https://ccd4a2e6-63e2-4dcb-a02e-1ae1253dabcc.filesusr.com/ugd/059ff1_535f9434e31649f4bf4ff2f72e5c6853.pdf?index=trueIn PDF document text
    • https://6376acfe-5884-4251-b3d5-19a03c044549.filesusr.com/ugd/de3d83_1487a9cd7014466d98d83452a6aebc64.pdf?index=trueIn PDF document text
    • https://46fb9a51-9e16-4ad8-811e-2f7ed01702f7.filesusr.com/ugd/53363c_93a4f68e4fd04ca982e3306451453969.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/59ebbe5a-31fc-4c2c-9a81-1663229be391/generic_audio_driver_for_windows_10_64_bit_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69f8bcf2-9b10-48ec-b0e3-01e9db45e4ea/8966809905.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55006ff1-61a7-4e7a-839b-84956382f135/9038794740.pdfIn PDF document text
    • https://0e8f88b9-656e-4b05-9cd8-8bd477f85547.filesusr.com/ugd/95b9ea_6cc729b06b3649d382b91b8fcffaf231.pdf?index=trueIn PDF document text
    • http://sonazorapabame.epizy.com/22695123589.pdfIn PDF document text
    • http://divifafapinuk.rf.gd/67860230531.pdfIn PDF document text
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_9f0ca88d14184b0cb178873e3805d7ef.pdf?index=trueIn PDF document text
    • https://cf268418-7549-4780-9cff-e39e61b5276c.filesusr.com/ugd/0b1cf2_b1e95283d18243ee91f68b8769a56ca7.pdf?index=trueIn PDF document text
    • https://3f740848-0e57-4b51-8596-564812021bec.filesusr.com/ugd/cbe17c_e2833366482041cf909210f578a115da.pdf?index=trueIn PDF document text
    • https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_74afb52873b0403f8a9123e9432885d9.pdf?index=trueIn PDF document text
    • https://52a1af19-6946-4c37-aba6-ab00a30e4874.filesusr.com/ugd/5dc3ca_ddd1a04a488d40d8bebc930432c1d9f4.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_off0000f0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B0 5384 bytes
SHA-256: 9070e72ba08c13241ac2d7cd7a9a6475d0fbe25323ed0d1406d9e00368b3cbe7
font_01_sfnt_off000102ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CE 11328 bytes
SHA-256: 33b51f87636abdf4a03cbe45b9c4c795006af2134ccbc76ba33f6245a92dc9ce

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