Malicious PDF — malware analysis report

Static analysis result for SHA-256 f81116ddbf969951…

MALICIOUS

PDF

89.9 KB Created: 2021-03-27 10:53:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: f45e1dee8505e9d94596dbcddeb5c829 SHA-1: fc7ecb1b94d83641d6fa186a04cdb0045ed28a21 SHA-256: f81116ddbf969951eeacbec000ea0e96baf6657b568c0d8d5d5fcbc1ffbd2755
156 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The PDF contains numerous external links, with one prominent URL pointing to a site that appears to be part of a link farm designed to distribute malicious content. While no scripts were directly extracted, the PDF structure and the presence of external links suggest an attempt to redirect users to malicious sites, likely for malware distribution or phishing.

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 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.
  • 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://leonvi.ru/award?keyword=para+al%25C3%25A9m+do+materialismo+espiritual+pdf PDF link annotation
    • https://zevofukuje.weebly.com/uploads/1/3/4/5/134585027/526f7fbd41201e0.pdfIn PDF document text
    • https://rovibabewovel.weebly.com/uploads/1/3/4/8/134884015/jumafibep.pdfIn PDF document text
    • https://woziwunamewig.weebly.com/uploads/1/3/1/6/131606321/7700785.pdfIn PDF document text
    • https://nizevamil.weebly.com/uploads/1/3/2/8/132814567/b52515b.pdfIn PDF document text
    • http://rigizaba.iblogger.org/army_gd_admit_card_2018.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fazujo/91921344505.pdfIn PDF document text
    • https://3caa4030-7dd6-4be4-8a8a-e1981c45b3cd.filesusr.com/ugd/704988_36b752a9b16949e09d8bde11a488556c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/33506346660.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/xezuzuwutebibokol.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/fipufi.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/95522330603.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/23362993500.pdfIn PDF document text
    • https://2cfcb734-ec62-4cd9-b61c-03d4762ad765.filesusr.com/ugd/a891c0_2fcbbdfc913240f185ed16a5b8e4d87c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mokixetat/pifejowurapobe.pdfIn PDF document text
    • https://3d7c42e8-cad9-4196-8f3c-0f210fd97588.filesusr.com/ugd/1b7c00_b86980e9e9aa49f7a9f4cbf288602691.pdf?index=trueIn PDF document text
    • https://e60c805d-b9e1-47fc-b045-983511e9ac1f.filesusr.com/ugd/116bb2_04127092896a41ceb66c25bbb2b44bed.pdf?index=trueIn PDF document text
    • http://fufamiwebo.epizy.com/samsung_galaxy_note_3_battery_price.pdfIn PDF document text
    • https://121f8fc1-d270-4171-a721-8ccd656fc20f.filesusr.com/ugd/2ca22b_fc42e3ff645b4008bff6f2765b913b02.pdf?index=trueIn PDF document text
    • https://46c19374-600d-43be-a5f2-d8bf07c6fddf.filesusr.com/ugd/cc94a4_6307bd1144a04605a4c452b1828b6c20.pdf?index=trueIn 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_off00011e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E70 5328 bytes
SHA-256: e8ada9c79b685c2dc29cea3d4c15e53cc9e5b98158e4224c730716c8600a9647
font_01_sfnt_off00013032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13032 13232 bytes
SHA-256: 953d6de19289dc7802f220dfba5fecb0f72baf505ac3f684efd2631504b35284

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