Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1a9fe3b46360368…

MALICIOUS

PDF

81.9 KB Created: 2021-05-20 20:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1e4d126d197a62b01733365145560377 SHA-1: 64b8c2e7c3ec292a56c68400d61e8e1a93dbc9b3 SHA-256: e1a9fe3b46360368415169792fdffd092d511c5ddf122ee4b6c2e58a7de171d5
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous external links, with one prominent link pointing to 'kuzutuzo.ru', suggesting a link farm or redirection to a malicious site. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, likely for SEO manipulation or to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://kuzutuzo.ru/strik?utm_term=math+word+problems+with+answers+grade+4 PDF link annotation
    • https://netebina.weebly.com/uploads/1/3/4/5/134596662/dd6a66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375210/normal_6038f2718fd56.pdfIn PDF document text
    • https://netajetuz.weebly.com/uploads/1/3/4/6/134651380/5076447.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478655/normal_6025ce3c97105.pdfIn PDF document text
    • https://poxawakepuk.weebly.com/uploads/1/3/1/6/131606289/a524e35522112e.pdfIn PDF document text
    • https://rozomibevepozif.weebly.com/uploads/1/3/0/7/130775668/panegalaxifabuviv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372382/normal_6027c96d6d9db.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/6279a65f-e143-4154-84af-94a381280582/is_lg_refrigerator_reliable.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/97335010903.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/56761762978.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/plant_molecular_biology_reporter_issn.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/20642753931.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12ad5584-7ab6-4795-8338-f969f24a0e49/37080711109.pdfIn PDF document text
    • https://s3.amazonaws.com/rivazixexuguri/fresh_graduate_resume_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/70528409636.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/darkest_dungeon_character_guide_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/kofikozobakum.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/titration_curve_of_all_amino_acids.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/96128620150.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/zitakujiz.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/vubovifarowidorip.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_off00010240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10240 5700 bytes
SHA-256: 56506de55ad84ec293bc486ef80495f2ff416250185ba23b884e7b858283f203
font_01_sfnt_off00011594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11594 10792 bytes
SHA-256: 0da0d96fb870c934000124216c1a2c3dcdd71164e1b2dbc8f3722e1eb18b3f2d

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