Malicious PDF — malware analysis report

Static analysis result for SHA-256 230c1c54dc030edc…

MALICIOUS

PDF

78.2 KB Created: 2021-03-09 21:48:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 2602fca0cd431edc92e8527ac6aff568 SHA-1: db842cf91f6a9caa5987e5904134504ac0d70e81 SHA-256: 230c1c54dc030edcc6206e587ed60c3b4d46074f4d0c2a0806fb4dfb85171793
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary URLs, 'https://jottigo.ru/123?utm_term=arthritis+uk+shoulder+pain+pdf', suggests a lure related to medical information to entice users to click. The presence of a ClamAV detection and ML classifier flagging indicates malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://jottigo.ru/123?utm_term=arthritis+uk+shoulder+pain+pdf PDF link annotation
    • https://cdn.sqhk.co/lawipavoso/hcgeier/godagajamuxegox.pdfIn PDF document text
    • https://cdn.sqhk.co/vixemujomu/heAXicC/56796196056.pdfIn PDF document text
    • http://lizowaw.scienceontheweb.net/face_360_mask.pdfIn PDF document text
    • https://cdn.sqhk.co/nimotixalulo/jahai2I/city_car_driving_simulator_2018_download_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480905/normal_602a0a356a0d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419822/normal_6007b6b3dbeef.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/jalasilunaz/emotional_intelligence_test_for_employees.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/good_cv_templates_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/nevatevinuk.pdfIn PDF document text
    • http://domuromu.atwebpages.com/are_volvo_expensive_to_maintain.pdfIn PDF document text
    • https://e082cb0d-9c22-4a21-acb7-e2c6127a51d3.filesusr.com/ugd/ff0c06_ce5615679cdd4c36a192f11a1264859c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/tim_grover_relentless_cleaner.pdfIn PDF document text
    • http://nerezusilanake.atwebpages.com/tidikava.pdfIn PDF document text
    • https://84d51d8d-5932-465a-b044-5d36dace581c.filesusr.com/ugd/98e2de_f7b49cda3447472289233190e906240e.pdf?index=trueIn PDF document text
    • https://a5fc3680-5c08-4cda-bd6c-abaa3bdf25bc.filesusr.com/ugd/ea5d7b_a39dd6773e8c4c898c86d90af5dfcddb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/zerozagimobadifuf.pdfIn PDF document text
    • https://0108a07e-94d6-443d-bfa7-575dd38852ad.filesusr.com/ugd/756a01_7685f0943a6a4b449761912abaad5467.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/fonerakepawumeganixujupaw.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/latifedivuluxekosevesowu.pdfIn PDF document text
    • http://vekemelegewimo.atwebpages.com/best_21_inch_lawn_mower_blade.pdfIn PDF document text
    • https://068ba8bc-08b0-4b68-8151-f3c59c7a5775.filesusr.com/ugd/5a4aad_b0506b8e586042dfa0091447c6974c8c.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_off0000f64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64D 5180 bytes
SHA-256: d797f0e3547a689595a99c0e0720ba18fad28a22fe9ddaa48f87c5a5ba991c3a
font_01_sfnt_off000107e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E2 10496 bytes
SHA-256: ebc9bcc36cc07f23b3d15af154ab90003b2e23dd4a8bfc7a3f9b1a9cf3586767

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