Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcbdce2d4fa27018…

MALICIOUS

PDF

72.2 KB Created: 2021-03-28 20:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 935001f5f418cb0e6055dc901db6c0ee SHA-1: 78385cba2843da2507bb98f8af20801f70fcc6d4 SHA-256: bcbdce2d4fa27018861634b55ea46f670da329bd162b08a6a05e6ceb4bd3411f
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a PDF SEO link farm, directing users to various URLs. One of these URLs, https://nipisod.ru/strik?utm_term=sonic+reese%2527s+blast+nutrition+facts, is flagged as suspicious. The ML classifier and ClamAV also strongly indicate maliciousness, consistent with a phishing or malware distribution attempt.

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://nipisod.ru/strik?utm_term=sonic+reese%2527s+blast+nutrition+facts
    • https://cdn.sqhk.co/zagusebipin/cWjhdNG/latigo_romano_tortura.pdf
    • http://igme.site/gajanusunu3ri6y.pdf
    • https://cdn.sqhk.co/buganisazobu/igifgcv/moksha_yoga_calculator.pdf
    • https://cdn.sqhk.co/kobewudojuvo/hjeDjgA/33959301528.pdf
    • https://dusibijerike.weebly.com/uploads/1/3/2/6/132695870/gidomabibalodemil.pdf
    • https://tukibasitotaz.weebly.com/uploads/1/3/4/4/134445351/3349209.pdf
    • http://vumagiwupesaka.22web.org/zagomeposuruvinutamijibuw.pdf
    • https://wiwazojuxosupud.weebly.com/uploads/1/3/1/3/131379189/lixikowejefalonarek.pdf
    • https://cdn.sqhk.co/vadezewe/ajeifBy/wixojademutoxavuwapa.pdf
    • http://randname.ru/petomoxavek4gb3.pdf
    • https://cdn.sqhk.co/sifalavuxozo/g6eIc2D/dutemixupol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/720497f8-3557-4e04-9747-1466a4b5d1bf/40839337029.pdf
    • http://porugunime.epizy.com/be_here_now_ram_dass_review.pdf
    • https://uploads.strikinglycdn.com/files/62045d85-5fa9-4aa9-a607-4880346d63d2/how_to_draw_electrical_symbols.pdf
    • https://uploads.strikinglycdn.com/files/6161bc5f-73da-413b-b81a-c73226a96020/wheres_waldo_vans_collection.pdf
    • https://uploads.strikinglycdn.com/files/2ab3fa1b-7f6c-4474-8840-71985c8d3911/how_to_write_love_poems_for_her.pdf
    • https://uploads.strikinglycdn.com/files/faace2bf-f639-4faf-a45a-db6564431c7e/lagopixo.pdf
    • https://uploads.strikinglycdn.com/files/8c825085-29b0-4a09-bf28-b7501c01f11d/41591373492.pdf
    • https://uploads.strikinglycdn.com/files/91c17bdd-a02d-42c4-a75a-69575165c1a5/rigutojitudakav.pdf
    • https://uploads.strikinglycdn.com/files/d1e9d008-a48e-49f1-9906-29df845740be/39590117237.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d04d.bin
f3445588bd457bd65c60a40d0382fb1acee30eeea921ddaad94b3c255cfa5bd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD04D 5032 bytes
font_01_sfnt_off0000e168.bin
9a13805de871241abb292791b900d2744c4e866030bba75083e2ec9487b253a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE168 10352 bytes
font_02_sfnt_off000104e3.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104E3 4324 bytes

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