Malicious PDF — malware analysis report

Static analysis result for SHA-256 cac0259c473d314d…

MALICIOUS

PDF

78.8 KB Created: 2021-04-16 14:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: aacbf924d608631ac7add5f99c661028 SHA-1: df9c9a132415e1d5f839ddb0111dda9be3d38e76 SHA-256: cac0259c473d314dd917673a7a7f98f0470bfa61f0aeac45a23a46f47c357a50
194 Risk Score

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xezojetit.ru/strik?utm_term=calligraphy+letters+tutorial+pdf PDF link annotation
    • https://serarabasujuz.weebly.com/uploads/1/3/1/6/131606617/d159d.pdfIn PDF document text
    • http://degifutuv.scienceontheweb.net/98325974949.pdfIn PDF document text
    • https://wikexedijul.weebly.com/uploads/1/3/4/6/134659224/wimovuzavu_wozosirosejib_jawasev.pdfIn PDF document text
    • https://gobajirosalafos.weebly.com/uploads/1/3/5/3/135392744/9722714.pdfIn PDF document text
    • http://viputixezererej.66ghz.com/aqueous_humor_dynamics.pdfIn PDF document text
    • https://kusafowagu.weebly.com/uploads/1/3/1/8/131871480/bd27a4a6.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/004da31c-5a2e-4dfd-9d47-0939f726e30f/is_flipping_property_profitable_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1201889-f2fa-4b6d-9747-f33c11cb3de6/brother_hl-6180dw_fuser_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1667938e-6232-4b98-94b3-5dbf6dc37371/marotaledoradovupezefe.pdfIn PDF document text
    • https://87da31d5-d184-45e7-a456-0ad082c8bd65.filesusr.com/ugd/55e94a_5d3e172bf6af400d848bd745e07c9368.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3929f4f0-52f6-42d7-8ac7-1e1fdcfac720/53395052799.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3186ff5a-27f5-43f0-893e-14fa8b3f225c/the_conference_of_the_birds_ransom_riggs.pdfIn PDF document text
    • http://pavemamixazose.rf.gd/how_to_thread_brother.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/6064410409.pdfIn PDF document text
    • https://07d68bf2-0661-47e2-9ffe-eae068a071af.filesusr.com/ugd/fef806_4288044659724fabbc39b14cb0ac5cfe.pdf?index=trueIn PDF document text
    • http://wutorokanotomav.onlinewebshop.net/77092644392.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/elementary_number_theory_7th_edition_answers.pdfIn PDF document text
    • https://51bf459c-6b46-41b0-863f-532cf8a77e0d.filesusr.com/ugd/2eedf1_3d69f395ab5c48cea62d59786d894032.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_off0000f952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF952 5308 bytes
SHA-256: 2340aa4667c74e7818a716823948bcd34aa05b5481323a779df0b5c3d2e2422e
font_01_sfnt_off00010b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B62 10472 bytes
SHA-256: 322a69165ee47ba53fa5500facc3a7afedf7800a13a6f5de17558a47a64871bd