Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b52f80be4b5f89d…

MALICIOUS

PDF

79.3 KB Created: 2020-12-28 19:39:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c04916f1a39f89453ab0dc70f2ee493 SHA-1: ed9feb3986d64dcb5c1e6d045b672af85b1745cc SHA-256: 0b52f80be4b5f89dc0fa75a69cef67d04263dd682d11bc23590589d8e8a334a7
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically `https://traffmen.ru/strik?utm_term=slack+login+issues`. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://traffmen.ru/strik?utm_term=slack+login+issues
    • https://cdn.sqhk.co/vuzefegevo/aqkhfhi/depofiva.pdf
    • https://cdn-cms.f-static.net/uploads/4416143/normal_5fe60aaf2f0c3.pdf
    • https://tokenabasefegaw.weebly.com/uploads/1/3/3/9/133999291/wedenope.pdf
    • https://cdn-cms.f-static.net/uploads/4404990/normal_5fb2fcaf5a156.pdf
    • https://lufalejovi.weebly.com/uploads/1/3/1/3/131380058/3286229.pdf
    • https://cdn-cms.f-static.net/uploads/4365619/normal_5f90a246c7de5.pdf
    • https://static.s123-cdn-static.com/uploads/4421768/normal_5fc924f62d5ab.pdf
    • https://cdn.sqhk.co/wekonexiw/ghicdic/hot_wheels_unlimited_release_date.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vizegemawokaxe/bibliographie_ahmadou_kourouma.pdf
    • https://uploads.strikinglycdn.com/files/e47811b4-3e1d-4d2c-ad7e-8b124b5183a1/guideline_plasma_derived_medicinal_products.pdf
    • https://uploads.strikinglycdn.com/files/f8fa46bd-147e-4d0c-b16c-11bee581b2f7/starbucks_global_icon_mugs.pdf
    • https://s3.amazonaws.com/nabifovu/adobe_maker_not_working.pdf
    • https://s3.amazonaws.com/woxewiwupir/marketing_plan_template_powerpoint_presentation.pdf
    • https://s3.amazonaws.com/feborobegibew/automatic_call_recorder_android_apk.pdf
    • https://s3.amazonaws.com/jovekus/sandhyavandanam_yajur_vedam_morning_tamilnadu.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5f3.bin
a1a8018edb8f5ac01f22aaa8300841ac825ec92b5f3dc8ab5d78625aef0df810		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F3 5040 bytes
font_01_sfnt_off0000f72c.bin
26d5fe935eef653ddf55afc48d05d91be313908b2352e7dbae046af3813700f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF72C 10548 bytes
font_02_sfnt_off00011b0b.bin
700ff7bf493bf9bab5e7bd19ce07725d6ad682c9ec1bd4c381fbd4d74ba1924a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0B 16088 bytes

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