Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f34605df8223cb2…

MALICIOUS

PDF

77.4 KB Created: 2021-03-11 04:55:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15bfea0ca9cc2c82704b64d103a38474 SHA-1: b68dfe86b10cc7f545c6e7bb0cc9421514defeb6 SHA-256: 0f34605df8223cb2a8446f1626341ffe48cdee516c69e7640fd7e2a9e6d92b3d
176 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing lure and hosts a large number of external links, many of which are suspicious. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though truncated, suggests a context of a rental agreement, which is a common lure for phishing attacks. The presence of embedded URLs points towards an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://seumenha.ru/strik?utm_term=california+association+of+realtors+rental+agreement+2020
    • https://nametipij.weebly.com/uploads/1/3/1/1/131164318/fubagun-rebifofiwi-kofipi.pdf
    • https://cdn.sqhk.co/modonasuje/DU5ngcK/water_parks_in_pa_poconos.pdf
    • https://ladofozaser.weebly.com/uploads/1/3/4/3/134334290/rogadorosoda.pdf
    • https://linabodaku.weebly.com/uploads/1/3/1/1/131164293/kozowufekiwobofajaf.pdf
    • http://zikewexer.scienceontheweb.net/rekapexejozigig.pdf
    • https://cdn-cms.f-static.net/uploads/4416806/normal_601313fa6b06c.pdf
    • https://noruwapawufibem.weebly.com/uploads/1/3/0/9/130969999/toxalajirubol.pdf
    • https://cdn-cms.f-static.net/uploads/4407552/normal_60353007e3f22.pdf
    • https://cdn.sqhk.co/xawobovuji/fl9BKLK/nitujujeterikamugav.pdf
    • https://cdn.sqhk.co/posuwumujome/nnZidhj/buzuzepopopukomorijenutem.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lefemijip/agenda_giornaliera_2018_da_stampare.pdf
    • https://s3.amazonaws.com/lezopobigeza/kirapo.pdf
    • https://s3.amazonaws.com/vasofirida/cool_math_games_hangman_answers_famous_brands.pdf
    • http://sawesupunozigiv.atwebpages.com/50804839396.pdf
    • https://s3.amazonaws.com/jeponowon/pekiganuve.pdf
    • https://s3.amazonaws.com/mizeteb/transformer_bumblebee_cake_topper.pdf
    • https://cfff6b0e-fc0f-4d9c-a983-c0e60c8b2bfd.filesusr.com/ugd/c637e3_83efff8f712945fdb401d95582198b95.pdf?index=true
    • https://ff19a39e-637c-4fc6-80cc-750024e8dd37.filesusr.com/ugd/d217e2_2f2534e5219740a5a6e2d7ae2506a5b9.pdf?index=true
    • 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_off0000f01c.bin
78ed847de9804651655b1d54a9360f3cf9e155ea668657ef7adec17a663aefcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF01C 5380 bytes
font_01_sfnt_off00010256.bin
6fe2543b142ad6cae497587af86110729c2e6066b71681d2d0e0f3aef6ecffd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10256 11080 bytes

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