Malicious PDF — malware analysis report

Static analysis result for SHA-256 a97f8895daf4a829…

MALICIOUS

PDF

83.9 KB Created: 2021-03-15 17:52:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: f53e6b8566b67b62e2098ba1c9cd6b6e SHA-1: 5832c745ac2ef7bf229aa26e9d4126e6614c2c26 SHA-256: a97f8895daf4a829db70e70c0f7877c552176156a90f69b2a09d441c9dcb6bef
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically targeting a 'forgot guided access passcode ios 11' lure. Heuristics indicate the PDF is part of a link farm hosted on disposable domains, suggesting a phishing or credential harvesting attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://resalured.ru/123?utm_term=forgot+guided+access+passcode+ios+11 PDF link annotation
    • http://sis-paypal.com/3977362978qokbq.pdfIn PDF document text
    • http://slampochka.ru/xiwebipewaronagavitavori0mjas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485440/normal_5fce6fb799e8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492281/normal_6018e2945dd6f.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/uij4jeN/11727349358.pdfIn PDF document text
    • https://cdn.sqhk.co/jomububorava/hgleuja/25191208107.pdfIn PDF document text
    • http://romeita.fun/don_t_starve_together_updatewrqz8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426676/normal_6005c256e3062.pdfIn PDF document text
    • https://cdn.sqhk.co/vemosoveveb/gvichf0/44067784968.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375531/normal_601127c759954.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502248/normal_602f5f7922eb4.pdfIn PDF document text
    • http://doordash.fun/niwamub2wstk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450719/normal_6035749309925.pdfIn PDF document text
    • https://cdn.sqhk.co/nosuterib/hbijDib/wudese.pdfIn PDF document text
    • http://cabinetsop.xyz/sony_xbr55x850b_manualji7e3.pdfIn PDF document text
    • http://totalcreditcheck.info/john_deere_tractor_for_sale_-_craigslistp1vps.pdfIn PDF document text
    • https://cdn.sqhk.co/mugapowejog/ij8G8TO/33429755541.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/amoled_wallpapers_4k_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/investigative_report_writing_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/what_grade_is_nikki_maxwell_in_dork_diaries.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/ramujasefubolesowiraxomi.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF418 5216 bytes
SHA-256: e722ed0386a401841ae675e89d1999c39e2f1df45971f41ab428539ad7766b79
font_01_sfnt_off000105f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F1 11080 bytes
SHA-256: 6d204031cd6940cf09ccabcdb8623aea02121ca3e469db5dfa87c3127216545d
font_02_sfnt_off00012bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFF 16376 bytes
SHA-256: c3d0ee408bee49a88931d2ac630a9fb52e88a46fabab5a72aa19e78bbe1d3826

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