Malicious PDF — malware analysis report

Static analysis result for SHA-256 922f75e3b616ba26…

MALICIOUS

PDF

84.7 KB Created: 2021-02-26 15:54:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 43ae9c2ba05b058e875f4301548c4094 SHA-1: 7ba2f83302bf34a764377be3618ce3bf9ad58997 SHA-256: 922f75e3b616ba26a289b4a53a7f60cdd156cbfd8343bfebd9e3022df055eae5
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded URLs and the nature of the link farm heuristic point towards an attack pattern focused on phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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://midufefew.ru/award?keyword=my+swiffer+wetjet+isn%2527t+spraying PDF link annotation
    • https://xinejusitap.weebly.com/uploads/1/3/4/6/134630468/3770869.pdfIn PDF document text
    • https://fajorisovobune.weebly.com/uploads/1/3/4/7/134752278/3244880.pdfIn PDF document text
    • http://pugisapi.mypressonline.com/jowolokiripubarevifopej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458431/normal_5ff78ff91704c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415754/normal_5fcfe572499d7.pdfIn PDF document text
    • https://gesurori.weebly.com/uploads/1/3/4/3/134353915/jajufenosin-mupamot.pdfIn PDF document text
    • http://zawubitukete.22web.org/problemas_economicos_en_mexico_por_la_pandemia.pdfIn PDF document text
    • http://jivusibofonefud.mygamesonline.org/68079301639.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/the_lady_with_the_dog_theme.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jifobobaganut.epizy.com/excel_vba_copy_worksheet_and_rename.pdfIn PDF document text
    • http://pozidijapepore.atwebpages.com/87575134771.pdfIn PDF document text
    • http://merujepapi.epizy.com/diy_platform_bed_plans_king.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eefb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFB 5348 bytes
SHA-256: db307d8d37232103e8b976b6152cceec24af54f0614f363edc31caf3d73b331f
font_01_sfnt_off00010168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10168 2460 bytes
SHA-256: 643d4dbe57b66c77a8b412d61b04661521d7a471d91a2425ea16b87d842b854f
font_02_sfnt_off00010c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3A 10508 bytes
SHA-256: 855adc66deb2f0c6232929ee5b5feceb4fd46c0a3ffeede7ad24a9d2c5d1ae94
font_03_sfnt_off0001306d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306D 16036 bytes
SHA-256: 35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f

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