Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0bc34e457960258…

MALICIOUS

PDF

91.8 KB Created: 2021-03-02 08:42:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f3dd94502b28c8da64b2305fe61f5be1 SHA-1: f3296bc4441bd90dbf8a14051eeddfed312d8744 SHA-256: f0bc34e457960258788de57d1ee6cbe5e59ebb6d0d117d1453eefb1a9522a758
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic and the ML_NYX_PDF_MALICIOUS flag. The document body, though heavily obfuscated, appears to be a lure related to a common search query, suggesting a phishing or scam attempt. The primary malicious URL identified is https://yafferge.ru/strik. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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.
  • 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://yafferge.ru/strik?utm_term=what+item+at+taco+bell+has+the+most+calories In PDF document text
    • http://wumiwuzigimo.mywebcommunity.org/rukopotojemovepaku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372723/normal_5fd0de7c900c7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412173/normal_5fc7c387916a3.pdfIn PDF document text
    • http://vugekowuzujed.scienceontheweb.net/16555298036.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423188/normal_6032d77b70931.pdfIn PDF document text
    • http://alluniversity.fun/blank_zimbabwe_affidavit_formztmd7.pdfIn PDF document text
    • http://mkuu.club/vofeditevudivabejezitiju6towd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459796/normal_6030fa1fed1cd.pdfIn PDF document text
    • http://befigter.xyz/jolizubemifarewewoteta8lcb7.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/jusagi/jewsons_plasterboard_sheets.pdfIn PDF document text
    • http://zejusamipokera.myartsonline.com/61116705187.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/doctor_sleep_directors_cut_differences.pdfIn PDF document text
    • http://bemuvubovewe.epizy.com/principles_of_microeconomics_2nd_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/nalemovewipupisi.pdfIn PDF document text
    • http://ronapidilejok.rf.gd/46852591561.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00013497.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13497 25124 bytes
SHA-256: aad90631e5aff843886aba1dee5361e3128288ba75e53f904309643d5f944d33
font_00_sfnt_off0000fd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD39 5192 bytes
SHA-256: f85720cd912cb4bc4dab63ee4aa0ab7b6f00eb21c43cf63563039f6fdfccd8b4
font_01_sfnt_off00010ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC3 11012 bytes
SHA-256: 563345b841ffcb6dfb503f109d616e580907b7cf9e597c16a0dcad75f1e797db

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