Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6804aeeda53260a…

MALICIOUS

PDF

80.7 KB Created: 2021-03-27 22:12:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65b579708346cb34883081fd2a94acdf SHA-1: 7690e9dc42e86ac4aef40074efeb413b2dd8f8d6 SHA-256: c6804aeeda53260ad338ef29fb80a1835d1d5cd530d1630f94c91706174eedca
156 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many of which are likely intended to lead users to malicious sites, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The embedded URLs suggest an attempt to direct users to potentially harmful content under the guise of academic or informational resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/award?keyword=endophytic+fungi+pdf
    • https://mokenexub.weebly.com/uploads/1/3/4/4/134478104/4ec112a52.pdf
    • https://static.s123-cdn-static.com/uploads/4384836/normal_600550bf0a349.pdf
    • https://cdn-cms.f-static.net/uploads/4416787/normal_6024b325e3945.pdf
    • https://mosejibufo.weebly.com/uploads/1/3/4/4/134437632/nadivilinukozonivob.pdf
    • https://wadezadoli.weebly.com/uploads/1/3/0/9/130970015/257433.pdf
    • https://cdn-cms.f-static.net/uploads/4411246/normal_6032d03f58faf.pdf
    • https://cdn-cms.f-static.net/uploads/4408355/normal_603bde894ebb0.pdf
    • https://nosisakapu.weebly.com/uploads/1/3/4/7/134773138/7501041.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/db0c548b-e3a8-468d-b236-93f73acc7fea/gmat_practice_questions_and_answers.pdf
    • https://uploads.strikinglycdn.com/files/f4c7f12d-6bac-491c-9586-94b8e75c9135/why_does_my_roomba_not_charge.pdf
    • https://5849b288-062f-49f8-a71b-da420f1f00fd.filesusr.com/ugd/c068f8_33b5ea85d43d4390bc0fadccd459b125.pdf?index=true
    • https://s3.amazonaws.com/mejigavukolu/xazizemumogixinamiv.pdf
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_476f0c8061624af9bc7f91186e6bc72a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/48125d1e-e1f4-4909-affd-6cc0072fb133/kaladajefo.pdf
    • https://uploads.strikinglycdn.com/files/76546cdb-611a-4423-bccb-7d806782bc7b/allen_bradley_1756-en2trk.pdf
    • https://uploads.strikinglycdn.com/files/de8294c0-e084-4c3e-a6a6-c657695292b2/windows_7_ultimate_service_pack_1_download_64_bit_torrent.pdf
    • https://uploads.strikinglycdn.com/files/e3cd72c2-e7bb-4b4a-a5b5-a4dfbea0e564/what_are_the_major_parts_of_news_story.pdf
    • https://uploads.strikinglycdn.com/files/7acd2806-8363-4868-92fa-4230c6b1a193/pelibivel.pdf
    • https://s3.amazonaws.com/xoxaneral/77053199168.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_off0000fab5.bin
109b322633106e6d22c0e99bfaeff1149c30a99a4fc7c00b44a9cdb2e3b73caa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB5 4960 bytes
font_01_sfnt_off00010bb0.bin
9f849a7aef6a190f2d4912f973bfa869f31e03d5c7cd166aaef3fe298ccb5d6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB0 12628 bytes

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