Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8930c0049cafd75…

MALICIOUS

PDF

75.9 KB Created: 2021-03-19 04:35:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad6f9f4b2970cc8d242fea57c91e27ca SHA-1: 7dffdd9e7e89656253c98090b609c8d88ad013da SHA-256: a8930c0049cafd75c589f82c92669966566944ac86f4230be789780dd2e2fcab
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are to benign-looking PDFs, but one primary URL is suspicious. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript, though not fully analyzed here, suggests an attempt to exploit PDF vulnerabilities or redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/award?keyword=work+rules+laszlo+bock+pdf
    • https://zexosupalagal.weebly.com/uploads/1/3/4/8/134887224/basebixumujepolodi.pdf
    • https://nifavoweju.weebly.com/uploads/1/3/0/7/130739528/5229310.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3d7c42e8-cad9-4196-8f3c-0f210fd97588.filesusr.com/ugd/1b7c00_b9588c9ca5874db7a95f209ea2052f1f.pdf?index=true
    • http://sodokeb.epizy.com/tonazasefajaf.pdf
    • http://xofigawarogipiw.rf.gd/saaq_car_valuation_guide.pdf
    • https://506dbbd1-d4b3-44b1-a4c9-6b5d0cab6a23.filesusr.com/ugd/c75f60_7e6f7deefccd4ac4b1c75833915c5bb1.pdf?index=true
    • https://c827806f-f9bf-4fd3-a4ce-e487c020fa79.filesusr.com/ugd/6fd45c_1615d9c9f56642ad933000e693fe95ca.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4e638418-19b1-4b8f-a9b2-520a0624882d/can_you_share_a_on_facebook.pdf
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_26043d94070d45d383125b6053b2f68d.pdf?index=true
    • https://f3874c2d-c116-49c2-b7b6-9300dc8fc43e.filesusr.com/ugd/b11f6d_cda92b0cc354428cb7b291ac6f25d89d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a488b53d-8c5d-458c-82c6-079836c7c1a1/vector_calculus_susan_jane_colley_4th_edition.pdf
    • https://uploads.strikinglycdn.com/files/f46b4361-7008-469b-bd47-bbe9ed3a4916/62673124633.pdf
    • https://0cac8d86-6e1f-48af-a655-32821961a13f.filesusr.com/ugd/7dd30d_923db38e54e847c9adfb2652eb7d3e99.pdf?index=true
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_c7672bd37262466b8832be5e6e0c13aa.pdf?index=true
    • http://fobadosox.epizy.com/vusajememukunajob.pdf
    • https://53ebb62d-ddaf-432f-8dc3-1f4746653467.filesusr.com/ugd/bbd3cf_807ff36b49374ca2ae7c359e0c33b055.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0794a85f-9478-483f-8a2c-a1fd593546b0/74045642456.pdf
    • http://vatimofaxemog.rf.gd/92467692815.pdf
    • https://uploads.strikinglycdn.com/files/513bda77-b05a-4185-aff7-9a001a714cf9/zone_of_proximal_development_higher_level.pdf
    • https://33edd578-4186-4695-89f3-f56a5a23fc53.filesusr.com/ugd/f17c08_6151101d170643be9f710496c8b83ab4.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_off0000e7b6.bin
9fb7e88cfd2aea9500f6be713c09c77bf84deeec047b53b99aafcfaad1b359fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B6 5416 bytes
font_01_sfnt_off0000fa44.bin
64604456dd87cb0c5e1934faac4b1d0c0bcc982ea9c9785b43200d8fadfb241f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA44 11288 bytes

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