Malicious PDF — malware analysis report

Static analysis result for SHA-256 505334114d2506ae…

MALICIOUS

PDF

77.8 KB Created: 2021-03-14 11:58:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d36efcaa35697efafc5f644d816ca124 SHA-1: 9613034b3e01a9e5347c40f03d20d86374a2c1b5 SHA-256: 505334114d2506ae2928908e3ea8c606a7f5e50dcdec3c66fc8dff4173dbf44b
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, with one suspicious URL pointing to zajinet.ru. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest a phishing or link-farming attack pattern. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

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-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://zajinet.ru/123?utm_term=beat+maker+go+mod
    • https://cdn-cms.f-static.net/uploads/4402953/normal_5fdb2304225dd.pdf
    • https://cdn-cms.f-static.net/uploads/4388612/normal_602af3a037017.pdf
    • https://static.s123-cdn-static.com/uploads/4414679/normal_5fe360bf1b53c.pdf
    • https://cdn-cms.f-static.net/uploads/4485156/normal_6036c87d8d133.pdf
    • https://static.s123-cdn-static.com/uploads/4373782/normal_60098cafb4abc.pdf
    • https://static.s123-cdn-static.com/uploads/4451744/normal_5fdfa58309108.pdf
    • https://cdn-cms.f-static.net/uploads/4387938/normal_601ee252c99c0.pdf
    • https://cdn-cms.f-static.net/uploads/4415951/normal_602f516a8a996.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5e54824a-8208-41b0-8aeb-7c017e8cfb46.filesusr.com/ugd/f64db8_6896e2015408412b8f4eccb9c76a0206.pdf?index=true
    • https://uploads.strikinglycdn.com/files/13d4ba2b-7b70-4ee6-afc9-7243cb18df8b/rimitokijelemafatedal.pdf
    • https://e22e8d81-f41f-4d51-abb1-39b19d2d32bb.filesusr.com/ugd/96bf9d_2260ec7e096545f18e1727339f72f638.pdf?index=true
    • https://s3.amazonaws.com/bejenosugede/free_invitation_templates_thanksgiving.pdf
    • https://s3.amazonaws.com/gomaxod/full_marks_guide_class_8_science_online.pdf
    • https://uploads.strikinglycdn.com/files/1fe5a89b-92f3-4035-bfa1-d34a4f3d212c/3_digit_subtraction_with_borrowing_worksheets_2nd_grade.pdf
    • https://s3.amazonaws.com/bifadiwuwileji/zepufexufijemit.pdf
    • https://a3c35cc3-4a3f-4d41-ab51-8b3e4b114d30.filesusr.com/ugd/2b25b5_af30141cbc07459186b6c44f0ee3b6ea.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ab71a09d-7c87-4dba-8fbb-be8e5341bf5e/what_does_an_operations_manager_do_in_a_business.pdf
    • https://98748e4b-3258-471a-903e-8ea98415cca0.filesusr.com/ugd/fd7405_14315b5e1b444ff8b4771fbc98aff380.pdf?index=true
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_ffe186f2719f41b8abb951a7fc599fa1.pdf?index=true
    • https://s3.amazonaws.com/sezewu/arroba_definicion_informatica.pdf
    • https://s3.amazonaws.com/matogapibelifiv/31916885548.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_off0000f18f.bin
ceb68bca07feb29f8cb20a44dac33431c32eb7e69353fe9eb404a620914a0dbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF18F 5048 bytes
font_01_sfnt_off000102aa.bin
ebcdeb31e831d9f5fc2350c5785fbd344ad7eb88aab48041e40ec3123135f75c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102AA 11160 bytes

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