Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a593a9d4f349ddb…

MALICIOUS

PDF

68.7 KB Created: 2020-11-11 22:30:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 34486bea97e771f120e6f5635727c2fb SHA-1: 9cbd31234c5829e2761d7bc4252d11c534b1dc99 SHA-256: 6a593a9d4f349ddb0b6adabddf05b3cd676cd92e241f4d6676dec44dd2730872
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to other PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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=starbound+rpg+growth In PDF document text
    • https://fidevawane.weebly.com/uploads/1/3/0/8/130814252/1465301.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388272/normal_5f930752372c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459776/normal_5fa95c748a474.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384144/normal_5f9b155a2ad9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419225/normal_5fa0b2b539847.pdfIn PDF document text
    • https://suxifobafip.weebly.com/uploads/1/3/4/3/134370270/jupotu.pdfIn PDF document text
    • https://tusidotug.weebly.com/uploads/1/3/4/4/134482214/lurusuwawipogepedozu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374211/normal_5f93f72fcd312.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/c6f85e36-6e7e-4640-8953-0fd49d4772dc/words_with_letter_f_for_preschoolers_images.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/amparito_roca_partitura_flauta.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/44118315165.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/10728717670.pdfIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/pevisajixaperabuxatemej.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/wejitesebugatarakoti.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/tyrones_unblocked_games_papas_pancake.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC67A 5348 bytes
SHA-256: 7d2e61ee89ed24522b077410e5d5d4103abab53cf628c966e2280b74349d9d64
font_01_sfnt_off0000d8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A9 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off0000e137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE137 10288 bytes
SHA-256: a011fe27438dcf78833838a0406f2ced14ccbe39a2806d8797cfa4359080b0a6

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