Malicious PDF — malware analysis report

Static analysis result for SHA-256 341ed3f1d0eabf5d…

MALICIOUS

PDF

82.2 KB Created: 2021-09-16 21:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5607c33e79e678f0f106f53a72aa16ca SHA-1: c6b5525fddc75ee70623ef2b1c5eb4d1019e9bb6 SHA-256: 341ed3f1d0eabf5d7b4e97a19398eefc1d2ef8284d28fd6d914910d4b3744f1c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The `utm_term` parameter in one URL indicates a potential attempt to track user engagement with specific lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://alda.pl/ckfinder/userfiles/files/lenebajubopuli.pdf In PDF document text
    • https://soosekszer.hu/upload/files/mesefitifofunot.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/zurufasin.pdfIn PDF document text
    • https://blugarden.eu/file/49329948817.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/79636051415.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138980932930---52740207913.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/22701051012.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/reguvuzupak.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/91520837139.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/kixavor.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/wagegasuridudojepulubu.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/26298355450.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/batabesowurela.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/78307734060.pdfIn PDF document text
    • http://candientuvibra.com/images/file/kobipexuwat.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/janen.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-03/100d37ea58215d2c149d532d1bb173cf.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/755093344.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/61406255025.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/43089920508.pdfIn PDF document text
    • https://12shio4.com/contents/files/xofasitaxikovodi.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/pusidirize.pdfIn PDF document text
    • https://aqualibramontois.be/fckdownload/file/jomifatixukileditix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=run+ipad+apps+on+androidPDF link annotation
    • 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_off0000dedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6ED 17420 bytes
SHA-256: 8e6e35d6d968b89a0ba9c5c7c98053cd9e01710f2cc73531fe17d830e4853aff
font_02_sfnt_off00012443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12443 10256 bytes
SHA-256: f6deeaf18d5baf4114b73990b757ebe935e55769ca08741eb0d45deae370f84c

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