Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f07b8368cdd6cda…

MALICIOUS

PDF

72.2 KB Created: 2021-09-12 10:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a27c907ca62414181837f4b617e7a299 SHA-1: 584e05b5db0fa0ce06f1372da6e17056324a21f2 SHA-256: 0f07b8368cdd6cda08556f0440deedf8fb5428752a905a63cc6b2f2c660a04dd
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominently featuring a 'download 5g network apk' lure, suggesting a social engineering tactic to trick users into downloading malware. The PDF's structure and the presence of multiple disposable link farms indicate a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://allytemp.ru/uplcv?utm_term=download+5g+network+apk PDF link annotation
    • http://galaxyjewel.cn/uploadfile/files/sikil.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/33122965893.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/livixox.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/jejejip.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/tudapokuxivapadadaziza.pdfIn PDF document text
    • http://alltechsro.cz/files/9658267849.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/29077910719.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/linunut.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a2d606a21283e6238fa7f9d83edfa41b/97192280298.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/nosanopasaruteb.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/pojejiremiguxaxadotakub.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/27948894816.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/kotuvewob.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/84671245917.pdfIn PDF document text
    • http://master-br.ru/img/file/34233981966.pdfIn PDF document text
    • http://rayanchem.com/d/files/gejibagaraw.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/8519471323.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/35156011269.pdfIn PDF document text
    • http://thecountryclub32055.com/userimages/73982850708.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/bibijubekaf.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-3/20210903181427707153.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/javuzi.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/gabazatuwol.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_off0000b7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF1 16732 bytes
SHA-256: 75909e790928de43b88fc61515c818715ac5eb9c19773cdedfa6b8958efefe11
font_02_sfnt_off0000faac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAC 10620 bytes
SHA-256: 7ab7fe7ab5c0323803df5e1fa5015d271bc93c5250d36e7b90913629d3044c90

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