Malicious PDF — malware analysis report

Static analysis result for SHA-256 264021a6915e3291…

MALICIOUS

PDF

81.2 KB Created: 2021-03-06 18:41:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 1bc776c5a0cbda0aebd46a87fe1c52af SHA-1: ef042893714f0208b94ceb3d21bbaea1adf83e56 SHA-256: 264021a6915e32916ee1aa3d9445e12ae09f1d51cf459f1d1987d7e5ced31f18
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/strik?utm_term=addition+and+subtraction+of+vectors+physics PDF link annotation
    • https://wubugivaruj.weebly.com/uploads/1/3/4/6/134669137/9481395.pdfIn PDF document text
    • https://lofemeraj.weebly.com/uploads/1/3/2/8/132814933/7018867.pdfIn PDF document text
    • http://sowoxapexemex.sportsontheweb.net/77493054864.pdfIn PDF document text
    • https://cdn.sqhk.co/lokojagivel/Dfu3rja/38057611900.pdfIn PDF document text
    • https://kasorewo.weebly.com/uploads/1/3/2/7/132740312/ede600b0769530.pdfIn PDF document text
    • https://cdn.sqhk.co/tumakakebi/G2EsieM/xevalexapademugab.pdfIn PDF document text
    • https://cdn.sqhk.co/xonipavu/jFIo8jd/bank_of_america_mobile_banking_features.pdfIn PDF document text
    • http://bovewitavivebu.getenjoyment.net/bose_sounddock_remote_control.pdfIn PDF document text
    • http://miwasigal.mywebcommunity.org/is_being_flushed_a_sign_of_labour.pdfIn PDF document text
    • https://vunafenivanisip.weebly.com/uploads/1/3/5/3/135303543/eb85a.pdfIn PDF document text
    • http://gopusoduj.mygamesonline.org/petsafe_shock_collar_instructions.pdfIn PDF document text
    • https://senorori.weebly.com/uploads/1/3/4/6/134641151/7edea7f620541.pdfIn PDF document text
    • https://lomivemaj.weebly.com/uploads/1/3/0/7/130739076/593f62a5d98f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbdf1d78-c4b3-4e16-bcf4-629dd25fbf2c/how_do_you_calculate_probability_and_statistics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fdc9f75-283e-4ba7-940d-abbb8ef921fa/how_to_clean_tankless_water_heater_coil.pdfIn PDF document text
    • https://0926596c-b1e6-4473-87d6-fed2e709bfeb.filesusr.com/ugd/e2a635_15328e3d87344a5e9a0851f23e7066df.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0e8d677-7cc8-407b-8959-56d9026c885c/is_dad_capitalized.pdfIn PDF document text
    • https://3a00e800-a8eb-44ae-aafc-ae9aecab8e06.filesusr.com/ugd/1715bf_ed417d71e7354991b9f37ae5ff6838cb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0507a739-d76f-453a-8670-dc4e047e7047/dapab.pdfIn PDF document text
    • https://9d1e48ad-bcd7-4831-9b7b-7108443a63b6.filesusr.com/ugd/136d07_a14c0dc461e440a684494a641e6a5601.pdf?index=trueIn PDF document text
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_cc6f4f6f6ad849c7b28c5a1088798f10.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/eeab8bdd-573e-41b3-ba72-0b3d4c34870f/wuwuloba.pdfIn 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_off0001003a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003A 5500 bytes
SHA-256: 900ea6216108f96964350760be6c305c81aed4f70f216c65023241ae09903e34
font_01_sfnt_off000112fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FC 10580 bytes
SHA-256: cc2dea2789306e35cf20a785b276a3142e5aef707af4d0d91d2e2d315e62bb85