Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e5985687c854246…

MALICIOUS

PDF

86.7 KB Created: 2021-05-06 15:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ab6de8d8b15e2feab20af5de4ac47dbb SHA-1: bcf6f70abe352fcb7ee2304695d9b9bffce7e1e2 SHA-256: 6e5985687c854246f999ee896095b75ed79c919b18c59356b1941046e1f0bf95
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The primary malicious URL identified is https://soxebez.ru/strik. No scripts were extracted, but the PDF structure and link farm behavior are indicative of a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/strik?utm_term=is+star+wars+galaxy+of+heroes+pay+to+win PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470841/normal_5fea20a335844.pdfIn PDF document text
    • https://zugatesek.weebly.com/uploads/1/3/6/0/136082504/931482.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471256/normal_602b0f20761ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366010/normal_5ffa9e78dd9d0.pdfIn PDF document text
    • https://vizegibog.weebly.com/uploads/1/3/4/4/134458583/2876163.pdfIn PDF document text
    • http://leopolds.space/revepokexipuzat6z3g.pdfIn PDF document text
    • https://xevumijujivo.weebly.com/uploads/1/3/1/3/131383583/wozokeni.pdfIn PDF document text
    • https://tazesarazuf.weebly.com/uploads/1/3/4/7/134726557/8519913.pdfIn PDF document text
    • https://suxaposalepet.weebly.com/uploads/1/3/4/6/134677753/b8f0a7c8cc.pdfIn PDF document text
    • http://cocobuka3.xyz/4th_grade_math_practice_test_questionsa0zmw.pdfIn PDF document text
    • http://muldwych.com/operation_market_garden_booklrvcy.pdfIn PDF document text
    • http://amaryllis.space/nipamotolulobemopemifiqz39n.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7ed754b6-a209-4558-9281-0032c7ee8ade.filesusr.com/ugd/4329d7_a62c93797f214438bd944e9c8788b8f0.pdf?index=trueIn PDF document text
    • https://6b5d12f1-3bbc-48af-9ddb-5430d2fe15e7.filesusr.com/ugd/3bf302_a21b563468cd48b6b80bbefd7f442f6d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sasufufa/reif_statistical_physics_berkeley_solutions.pdfIn PDF document text
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_7c9803a0f7804b1e934944050caf74b1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dipafuxe/5457541822.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3eb124c-b917-4ae4-82e1-09d939588bd9/onan_4000_generator_troubleshooting_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f279786-8b6e-46bb-bd29-41e30efd748b/plantronics_voyager_legend_wont_pair_mode.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/deschutes_river_guides_maupin.pdfIn PDF document text
    • https://abf133a7-37c0-4616-b653-d99fd306bce3.filesusr.com/ugd/5c8236_b9c1eb3533bc47c0b063e6ea3714274f.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11190 5360 bytes
SHA-256: 09433889604a103867c3aea8c2b8d786c121807929ac24ea48707b73eed76611
font_01_sfnt_off000123eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EB 12980 bytes
SHA-256: 685cbdcc62d46b0b7dddd8d92948eda6125a6e677cd1d9ec34f7ea788573ecea