Malicious PDF — malware analysis report

Static analysis result for SHA-256 28f97d9dcb6bdad7…

MALICIOUS

PDF

72.0 KB Created: 2021-03-16 21:30:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f2c58cc37204639338a714223ec2c21a SHA-1: 19b04f3c66a6dd6acdecee0f2ac878462d1605c0 SHA-256: 28f97d9dcb6bdad739942de58bbd94641a07fd284371749f20a7390a6441dbe4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://dafemum.ru/strik?utm_term=csi+web+adventures+case+1+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379054/normal_5fcbc32fb4937.pdfIn PDF document text
    • https://lebabipiw.weebly.com/uploads/1/3/0/9/130968925/6824676.pdfIn PDF document text
    • http://verezitabel.66ghz.com/guidewire_developer_roles_and_responsibilities.pdfIn PDF document text
    • https://gifaxopolipo.weebly.com/uploads/1/3/0/7/130739444/fabize-navikitekosiwix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458412/normal_6025b0e6651a3.pdfIn PDF document text
    • http://motarojetox.sportsontheweb.net/casio_fx991es_plus_manual.pdfIn PDF document text
    • http://xedeporib.medianewsonline.com/carbamazepine_davis_plus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mijikabetabup.rf.gd/the_adventure_of_tintin_cartoon_in_hindi.pdfIn PDF document text
    • http://vizepojuduw.rf.gd/fefagolakogov.pdfIn PDF document text
    • http://bototiluwoge.atwebpages.com/how_to_use_m_audio_fast_track_with_audacity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/004ad3ce-c315-4cd4-ae44-c473bfbf34ae/how_do_you_explain_symbolism.pdfIn PDF document text
    • http://vunonam.atwebpages.com/is_kentucky_drivers_license_valid_for_air_travel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9c2cefc-7a6a-4359-91bb-70c940f27861/fiwiwuterejasi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dec8fd4b-a285-46aa-8b56-f775f3a76d08/wavugaramemogozab.pdfIn PDF document text
    • http://pivirujifija.epizy.com/97657045543.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9331d70f-a61f-4251-8933-7ed60265e303/78336670518.pdfIn PDF document text
    • http://forensics.rice.edu/In 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_off0000dadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADF 5152 bytes
SHA-256: 5d77234127c4aba973210a8ad5c52a295399a666328b8d9c5faac4f40421c93e
font_01_sfnt_off0000ec8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8D 11288 bytes
SHA-256: 74f25cf315aa0d3b41ebb1d26ad1df1d4c6572808c606e85f50a7d18684e56d0