Malicious PDF — malware analysis report

Static analysis result for SHA-256 e163676f31e8d892…

MALICIOUS

PDF

75.0 KB Created: 2021-03-18 21:48:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c782ab0df571194c6ba0dbb2123228e0 SHA-1: efd924f85bd7b38b14c115dd9c8a91b0168388b3 SHA-256: e163676f31e8d892d8c45239330cbbf40ac0512bd2f74f3d9bd1490c16f47b6f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous external links, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, contains text related to 'Cv maken gratis template', indicating a lure for job seekers. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/123?utm_term=cv+maken+gratis+template
    • https://cdn.sqhk.co/vimewiki/4jjCjio/altlife_life_simulator_apk.pdf
    • https://cdn.sqhk.co/fuzokikili/ajhWk5E/65627527799.pdf
    • http://blacklaser.ru/30546971589ounbc.pdf
    • https://cdn-cms.f-static.net/uploads/4454184/normal_600dbf2ab94d2.pdf
    • https://cdn.sqhk.co/togokitaz/eLjaHhc/61917190035.pdf
    • https://cdn.sqhk.co/daladovum/jeBfHIW/bottle_shooting_3d_game_download.pdf
    • http://gatorama.space/70382820454ddoq0.pdf
    • https://xoxisutebigag.weebly.com/uploads/1/3/1/4/131453062/8b2a93d70f972.pdf
    • https://cdn.sqhk.co/jofijoju/hewha4B/34010348475.pdf
    • https://cdn-cms.f-static.net/uploads/4380863/normal_60184c7720794.pdf
    • https://cdn-cms.f-static.net/uploads/4369768/normal_6041bcf1a5ea7.pdf
    • https://static.s123-cdn-static.com/uploads/4493610/normal_5ff570c6c2320.pdf
    • https://nivujetomut.weebly.com/uploads/1/3/4/7/134753784/4281704.pdf
    • https://weralafopibobal.weebly.com/uploads/1/3/4/3/134338927/dudusafel.pdf
    • http://gnfcns.info/18499478834nlotg.pdf
    • https://tuwebuliwarukor.weebly.com/uploads/1/3/5/4/135400964/wugonesatesavejed.pdf
    • https://gupovokezatiku.weebly.com/uploads/1/3/4/8/134878629/69b42c4f2c800e2.pdf
    • http://weareanonymous.org/bluestacks_apk_dosyas_ykleme8jzdc.pdf
    • http://nesobaka9.xyz/joxubifiditotatiwazefobij6pyao.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4cf8f9b9-f887-4f1a-a03c-657b61293f87/wotaruxipisoxanumanesu.pdf
    • https://uploads.strikinglycdn.com/files/efb33209-8862-4bfb-9365-4aa45d441253/sorry_not_sorry_naya_rivera_libro.pdf
    • https://uploads.strikinglycdn.com/files/57fecbb8-a2d5-4aa2-916c-d1a4467f4e98/century_quick_fix_wire_feed_welder_review.pdf
    • https://uploads.strikinglycdn.com/files/8e372eda-8734-4865-8e99-174e6aa8d363/caloric_gas_stove_replacement_knobs.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea35.bin
6402a12579a366364d96f2b52c6b7020805ff417b9ab6edd713784c0b2083bf7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA35 5168 bytes
font_01_sfnt_off0000fbba.bin
cd68e80b569aa991033f5ae10b83f2ba542008a2f550d56ef0f39fd7a41ac4e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBA 10280 bytes

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