Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a2eab8f6f82cb3…

MALICIOUS

PDF

70.6 KB Created: 2021-04-06 19:41:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 948ec2a1cc63b08facecc645da2dc3a1 SHA-1: 669facf4f9673e6ffade680235abdbae77a035ae SHA-256: a8a2eab8f6f82cb3bf67af53b983ad5a745ab408641acac5561b5d779d6968d5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-themed and point to other PDF documents, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the presence of numerous URLs suggests a redirection or download mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=chemistry+unit+3+test+answers
    • https://puxosuloboja.weebly.com/uploads/1/3/4/6/134677226/kedakatixizu-nenogu-podekaranijer-waxojalow.pdf
    • http://rabiwitijif.medianewsonline.com/anatomy_of_maxillary_sinus.pdf
    • https://dedemapisiwopiv.weebly.com/uploads/1/3/0/7/130775251/716d9833d2.pdf
    • https://jumegelizo.weebly.com/uploads/1/3/4/7/134712838/91d846af.pdf
    • http://bubiwikozexamo.iblogger.org/47835765151.pdf
    • https://tezenilul.weebly.com/uploads/1/3/6/0/136085996/f5dcba6ff.pdf
    • http://zeraseb.66ghz.com/13199038968.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tanukino.epizy.com/dragon_age_origins_feastday_gift_guide.pdf
    • https://s3.amazonaws.com/boxujetanonikuv/serezoxajumakiredimuvu.pdf
    • https://s3.amazonaws.com/nazekisigiduz/constructing_angles_using_a_protractor_worksheet.pdf
    • http://zajobape.epizy.com/vetedizeledudowidupodirel.pdf
    • https://s3.amazonaws.com/xewamejixolefaj/17524320354.pdf
    • http://vonisepo.epizy.com/najadukogafodebavufiwexo.pdf
    • https://s3.amazonaws.com/lunojol/62788507934.pdf
    • https://s3.amazonaws.com/rokuwapesu/lajutanajokivowakazurudem.pdf
    • https://s3.amazonaws.com/vawoginele/14655281093.pdf
    • https://s3.amazonaws.com/xalexojaxipud/zomofega.pdf
    • https://s3.amazonaws.com/tokudapele/pogil_kinetic_molecular_theory_answer_key.pdf
    • http://dolapevina.rf.gd/android_studio_default_button_color.pdf
    • https://s3.amazonaws.com/xifabilejilab/17676873083.pdf
    • http://tofalit.myartsonline.com/caracteristicas_aines.pdf
    • http://zelagipu.rf.gd/a_level_physics_notes.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_off0000d730.bin
ae3b94eefe357998349e5edf64ab9febd37439ff1cf46d233fdcd4796e3a0702		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD730 5156 bytes
font_01_sfnt_off0000e89a.bin
e118538c6a2fc45dfecc099099888e906ad0dd13146baaf6bc57772d9d602473		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE89A 10784 bytes

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