Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e09231b67e9004…

MALICIOUS

PDF

97.6 KB Created: 2021-05-29 10:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 44187774b27d516ea056c52f30f17a08 SHA-1: 436c949db6e0883790286634f11f373587bec943 SHA-256: 31e09231b67e9004a65e28ecbb6fe4e509f2fb418df9b6ad5f4735e6e9bf8c5f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO spam operation. ClamAV and ML classifiers identified the PDF as malicious, specifically a phishing trojan. The embedded URLs, such as 'https://ponafet.ru/123?utm_term=2016+acura+rdx+performance+specs', are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • 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.
  • 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://ponafet.ru/123?utm_term=2016+acura+rdx+performance+specs PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4494430/normal_603b5d5d652f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453907/normal_6000f994be378.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403565/normal_5ff7799b39c9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388272/normal_605575f08ca20.pdfIn PDF document text
    • https://xapozate.weebly.com/uploads/1/3/4/6/134698203/0f79211ea.pdfIn PDF document text
    • https://fazuzuxidugijef.weebly.com/uploads/1/3/4/4/134475184/vafodukikiwun.pdfIn PDF document text
    • https://lenudigibelap.weebly.com/uploads/1/3/7/4/137499492/kunizogiserina.pdfIn PDF document text
    • https://duwesokele.weebly.com/uploads/1/3/1/6/131606866/5704161.pdfIn PDF document text
    • https://sotinele.weebly.com/uploads/1/3/4/6/134640455/ripozulogoxotu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486221/normal_604fc6b1bac83.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473642/normal_5ff7745083092.pdfIn PDF document text
    • https://bavutenodedob.weebly.com/uploads/1/3/1/0/131071315/rezinabelikalivapa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367631/normal_6001b7a04db5b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421061/normal_5ffe4b03ee358.pdfIn PDF document text
    • https://fusopozosasotex.weebly.com/uploads/1/3/4/4/134477759/1362478.pdfIn PDF document text
    • https://xepuduwosijun.weebly.com/uploads/1/3/4/6/134634987/505f4caa7b566.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461232/normal_60523da291c29.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/9efe344b-ecc8-4af7-bc2f-0f592483281d/59791836107.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cd28a81-66db-44eb-baad-da99d5f06ee1/whirlpool_washing_machine_motor_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1458e8b-0116-4ecf-8bcb-8fc6d2760acc/xofadup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44bda8f9-8fd5-4827-9072-3c592156288d/master_of_orion_cheat_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff562035-73c6-4ad5-903d-454529473554/4ch_h.264_dvr_software_download_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b198c31-0004-42bb-9b32-4f59b154a5e8/tower_11_litre_digital_air_fryer_oven_manual.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000126f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F8 5724 bytes
SHA-256: 33e6a43883b8af6853e1a9252d77479316b7218e5e5a5b5ccd536dc86528aaa2
font_01_sfnt_off00013a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A5C 11716 bytes
SHA-256: f984f2d0350d152d8b867e283758fce66dde7162b83e4aaa7e7c4566e36d2913
font_02_sfnt_off0001626b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1626B 16088 bytes
SHA-256: 019e92530604f520106ad5c4b76966f1dd6ed19205c931d1b65f84b35f1178c0

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