Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1af5ca7a8922cef…

MALICIOUS

PDF

71.4 KB Created: 2021-02-25 19:56:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e811b4253f4574b42881c9dd832f4806 SHA-1: 1a330efdb6ad4a45b76e9b884431c479602bbd36 SHA-256: d1af5ca7a8922cef804622fcc53cd50ed0983d28e8b8aa1efccfbddc13dd6ad6
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure (https://crophysi.ru/aws). The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs. The presence of multiple links on disposable hosting further supports a phishing or malware distribution scheme.

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 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://crophysi.ru/aws?utm_term=caballo+de+troya+jj+benitez+historia+real In PDF document text
    • http://xojuxelase.medianewsonline.com/ryobi_bt3100_table_saw.pdfIn PDF document text
    • http://prostotit.site/what_is_the_best_programming_language_to_create_an_app47n8b.pdfIn PDF document text
    • http://lololoj.sportsontheweb.net/one_touch_ultra_2_battery_instructions.pdfIn PDF document text
    • http://beautytopshop.site/avengers_endgame_4k_uhdydj6b.pdfIn PDF document text
    • https://tanoviruxejalun.weebly.com/uploads/1/3/0/7/130775892/kokifolosa_rurizakolaped.pdfIn PDF document text
    • https://kumenesasewoton.weebly.com/uploads/1/3/4/7/134773405/panunesul.pdfIn PDF document text
    • http://gsmall.space/yamaha_01v96_v2_firmware_updaterhhzg.pdfIn PDF document text
    • http://dosijefa.mypressonline.com/how_to_use_a_greenlee_digital_multimeter.pdfIn PDF document text
    • http://vivekawiga.sportsontheweb.net/esv_bible_verses_about_trust.pdfIn PDF document text
    • http://hangzhoumetal.ru/broken_screen_app_freev6tld.pdfIn PDF document text
    • http://nasufulorejuwe.mywebcommunity.org/fl_studio_tutorial_hip_hop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kofaxafogi.myartsonline.com/94606459754.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/bugutot.pdfIn PDF document text
    • http://faxiruvud.myartsonline.com/28966451906.pdfIn PDF document text
    • http://rosajeku.myartsonline.com/defigatabibuvadogex.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD819 5184 bytes
SHA-256: a38998cd7c4e9b08f7f8ba98fe86760e97ea2f5d461b229c4856ce205c2ba9f4
font_01_sfnt_off0000e9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BD 11356 bytes
SHA-256: f99f8a3671aab6572bf5f0be952b2f89a4242c8b67b38983f410fb4d9303d3d2

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