Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb8220411c737a0…

MALICIOUS

PDF

89.2 KB Created: 2021-04-11 08:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 29b46920793d1de02dcb781dc261d402 SHA-1: 2b128fc831f43006e92816c58b61ee8019a78038 SHA-256: 1cb8220411c737a075b9e917dcafc05764904b5257e183cd425eadf35d300735
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The primary URL, https://mezovuduw.ru/strik?utm_term=mixed+verb+tense+exercises+printable, is likely used to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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 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.
  • 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://mezovuduw.ru/strik?utm_term=mixed+verb+tense+exercises+printable PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4378618/normal_5ff0eefe63771.pdfIn PDF document text
    • https://gajifawegux.weebly.com/uploads/1/3/4/6/134649352/bifonelozaju-xodikazifasexam-sajeletimib-zuresazumis.pdfIn PDF document text
    • https://cdn.sqhk.co/susojareb/4ahbjc3/76427405477.pdfIn PDF document text
    • https://xujuwoxevosu.weebly.com/uploads/1/3/4/8/134896670/vozefisugusesimuzuv.pdfIn PDF document text
    • https://cdn.sqhk.co/gadewekunel/NhgOYif/happy_birthday_cake_gif_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454824/normal_5ff58fdce6091.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402717/normal_5fc9b0573a67e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388813/normal_6060176c9a6d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465255/normal_6028368f57d97.pdfIn PDF document text
    • https://cdn.sqhk.co/wogefosa/geib9mL/fish_live_wallpaper_for_pc_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwisagilevi/gcWghhh/duweludejumini.pdfIn PDF document text
    • https://cdn.sqhk.co/kovixileta/giihWih/absorption_spectrum_of_chlorophyll_graph.pdfIn PDF document text
    • https://tojibigunezo.weebly.com/uploads/1/3/4/6/134644172/338767.pdfIn PDF document text
    • https://saxepuxuk.weebly.com/uploads/1/3/4/4/134472003/10358c37d984871.pdfIn PDF document text
    • https://cdn.sqhk.co/zitedefew/hqypeje/45142958118.pdfIn PDF document text
    • https://cdn.sqhk.co/remavaveso/Yijzlhh/4470732744.pdfIn PDF document text
    • https://cdn.sqhk.co/goronikel/eN0kT5y/5095676868.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b3079848-b07e-4d89-9244-05dfa5dd91fe.filesusr.com/ugd/3ab5ed_f41bc0cac723452796e5858d5d8e0a9c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bofake/how_historically_accurate_is_the_bible.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/47403740217.pdfIn PDF document text
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_6b2ddfd3591a4eacb37dd8d8ff2f5b37.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rebomedug/dewalt_20v_drill_set_review.pdfIn PDF document text
    • https://c788b29d-df2d-4d46-9946-349e8cce89b7.filesusr.com/ugd/a9e086_15d67120c2b34b65b7523e13955ebfa6.pdf?index=trueIn PDF document text
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_10e1cd44952d4b5c8ff6f14040f0a821.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/gebunojeb.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/62011663343.pdfIn PDF document text
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_5177b9663ed644f1b9f65d12ca357427.pdf?index=trueIn 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_off00010388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10388 5340 bytes
SHA-256: 28e1d16026bb08195765715509d69b8686f0111d13ff7a285e8c033c216a2ea8
font_01_sfnt_off000115cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CD 12064 bytes
SHA-256: ccbe3a95b41a2ef9b6511dcc10485ff9e73dc234d1cbcd768e0bd85af665d11d
font_02_sfnt_off00013f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F15 16416 bytes
SHA-256: b13feff8c5b564f7677060085945be61112f8f7aeeaada995cbedf689070d2bf

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