Malicious PDF — malware analysis report

Static analysis result for SHA-256 e257583877e66c22…

MALICIOUS

PDF

76.2 KB Created: 2021-06-23 00:17:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3020e100ee0e4a929be69d7da258cb4 SHA-1: c9e92ab4b0f76036bc0071355995dcb1df03ba85 SHA-256: e257583877e66c2255c7209ea3756c39f7da3ac81304331aeee9d1c2c53513c9
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tugarekuxu.weebly.com/uploads/1/3/4/3/134307697/aec12cc69a5b823.pdf
    • https://cdn-cms.f-static.net/uploads/4462059/normal_601027fdd14b5.pdf
    • https://cdn-cms.f-static.net/uploads/4372085/normal_6034f92260824.pdf
    • https://cdn-cms.f-static.net/uploads/4497348/normal_5fd7c14a96f63.pdf
    • https://cdn-cms.f-static.net/uploads/4475380/normal_606198916159d.pdf
    • https://potijesidademut.weebly.com/uploads/1/3/4/3/134351663/wubazuresunaj.pdf
    • https://cdn-cms.f-static.net/uploads/4447465/normal_60462c05c8c56.pdf
    • https://nitenativab.weebly.com/uploads/1/3/4/6/134698737/5476467.pdf
    • https://cdn-cms.f-static.net/uploads/4474999/normal_600e3484c6ad6.pdf
    • https://gekibevuzoz.weebly.com/uploads/1/3/4/5/134503907/zurefagoduki.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/sq/ugae/~3/HbdJGeoIq_s/square?utm_term=mercedes+benz+w164+manual
    • https://uploads.strikinglycdn.com/files/8176c857-51fc-452e-8778-baf5fb79b78e/91607482162.pdf
    • https://static1.squarespace.com/static/60bf6c6a79613f649bb1d090/t/60cdd75a1a96e24d4ea5f755/1624102746139/seven_habits_of_highly_effective_teens.pdf
    • https://uploads.strikinglycdn.com/files/5957d8f3-fdcf-40a2-a00a-1acf3570dce8/nanostation_m2_loco_specs.pdf
    • https://static1.squarespace.com/static/60bf6c6a79613f649bb1d090/t/60cbda6060cb1e0578cd3540/1623972449062/38836502368.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60c91c4e7e65a66dcb2de47f/1623792719016/dasixumubugonukej.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60c8bd4f3dde6a3e762cb17a/1623768399531/gafeb.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60c4d9c699b3c572eba6bc71/1623513542900/jipevozalume.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60d22e6d2484ca233f410cf8/1624387182101/addrom_apk_download.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60cbfc077d058466d121cce5/1623981063796/guwakasurepes.pdf
    • https://uploads.strikinglycdn.com/files/e28209f1-b5eb-4a41-a34b-6d610cc11479/68144456331.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60cfdc03ea2dce2a1042e37b/1624235011333/25034773401.pdf
    • 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_off0000ed47.bin
11acc96290e228bc2c16f12f24a65f9271b77cd4bede2008430549bd5d1362e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED47 5664 bytes
font_01_sfnt_off0001009f.bin
1172e3f4cdcb56f7224911fd41d1e93890279220d6afceee32433bdc5e7e404e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1009F 10408 bytes

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