Malicious PDF — malware analysis report

Static analysis result for SHA-256 7059eeb21920d085…

MALICIOUS

PDF

78.2 KB Created: 2021-03-24 23:06:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: e4d844a460360250619bf35989bb90c3 SHA-1: 4b0493077a38ab3ea52839e37e9f1bc77ece0739 SHA-256: 7059eeb21920d085857a30049dcdb9309d369e196228082193370153d523f08b
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 designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/123?utm_term=employment+reference+request+letter+template PDF link annotation
    • http://dogoderusokita.iblogger.org/xinedataninaberapo.pdfIn PDF document text
    • http://damodudajipofem.22web.org/peratiwukadunulej.pdfIn PDF document text
    • https://cdn.sqhk.co/petebeki/SyLia9n/mesedatizutigonadajebev.pdfIn PDF document text
    • https://dagigokes.weebly.com/uploads/1/3/0/7/130739756/7796130.pdfIn PDF document text
    • https://wisapemewe.weebly.com/uploads/1/3/4/7/134713478/xejevixozegoluvukoga.pdfIn PDF document text
    • https://cdn.sqhk.co/nawamuzimosu/hefgeif/potowiboxugimez.pdfIn PDF document text
    • https://cdn.sqhk.co/fukonovum/dervrPP/fotijimati.pdfIn PDF document text
    • https://cdn.sqhk.co/rizijuwet/A2iaVfR/56982450537.pdfIn PDF document text
    • http://kijumubafenu.mypressonline.com/42436017488.pdfIn PDF document text
    • https://cdn.sqhk.co/wibetaxor/ojhbhIE/company_of_heroes_movie_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/nogugojuri/q7nbgeE/nutexes.pdfIn PDF document text
    • https://cdn.sqhk.co/loxinesupiva/jIobhb1/legendary_gunner_class_mod.pdfIn PDF document text
    • http://mazisim.mywebcommunity.org/12259831036.pdfIn PDF document text
    • https://cdn.sqhk.co/nuroteditu/jhieVii/72552950650.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/zeworibuzoza/gizelidumaxogufo.pdfIn PDF document text
    • http://nifekubipaxo.epizy.com/zijilakotixibesomitojizox.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/fun_activity_sheets_for_high_school_students.pdfIn PDF document text
    • http://fokafupu.rf.gd/cakile_maritima.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_off0000f352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF352 5348 bytes
SHA-256: 89e4f80e630b14e165a076472e9c7416f49aa3aa309d2f9783ad622a755256fa
font_01_sfnt_off00010580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10580 11096 bytes
SHA-256: fd6e427b08c1da23ed7de637c961726e14d8decb878017ceed5167dfc735c94e

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