Malicious PDF — malware analysis report

Static analysis result for SHA-256 699f02112a22ab5c…

MALICIOUS

PDF

75.5 KB Created: 2021-09-21 12:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b21db7cb444d544e32eae9cdf1342325 SHA-1: c78cfd68daf95ff17a277b90acadf40016f4d497 SHA-256: 699f02112a22ab5cef0d9938c45517c1eef5d2536dfea906a4983c3bad01e5d8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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
  • 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://crewmak.ru/uplcv?utm_term=vidmate+apk+history PDF link annotation
    • https://stradatextiles.com/upload/ckfinder/files/pokixuritakite.pdfIn PDF document text
    • https://thegmsbihta.in/userfiles/file/39762827626.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/mepesuxiniwazad.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/92059154416.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/90322938814.pdfIn PDF document text
    • https://speculatio.in/userfiles/file/99605583749.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161387c8c02217---rogerarumivesemudonela.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/zepenonilajitarubotip.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/dewutinifos.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/mebarosaman.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/55022658606.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/maridupapo.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/80050140593.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/17310074890.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/pakigovidulubaxexi.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/tagufanidusigejoz.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/10343055929.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/1tfjm6s7qsc6gfjbak9lehdr46/55995258657.pdfIn PDF document text
    • https://kingcom.edesign.fr/gr33/web/uploads/assets/file/33830701557.pdfIn PDF document text
    • http://boki.hu/editor_up/gatod.pdfIn PDF document text
    • https://blogsma.com/files/31833227801.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/7715496016.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC085 18264 bytes
SHA-256: f166ffeac9da17182b782782812a1339d9e73d4fe5ada7808b973333b2ff3b60
font_01_sfnt_off0000efac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAC 10684 bytes
SHA-256: 63cff201dac261ff2d44124167cc515b50d1a2dd2f0c96dfcfeb1d190e26a776
font_02_sfnt_off00010838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10838 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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