Malicious PDF — malware analysis report

Static analysis result for SHA-256 42026a3aa609d260…

MALICIOUS

PDF

75.6 KB Created: 2021-09-19 12:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8893ac6049d0df16b8b44a177c262d66 SHA-1: 2079d3cf0d0b8547ecc6fec724ed058a1d419cd7 SHA-256: 42026a3aa609d26017492f615ba17842ddd1f170f12f3bb82b84c036f3b15e0e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to link farms, and one specifically mentions 'pubg skins apk' in its URL, indicating a lure for potentially valuable or sought-after content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM suggests a deliberate attempt to obscure the final destination through a network of disposable links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://travelport.pl/userfiles/file/biwokesimikafit.pdf In PDF document text
    • http://apartmany.cucoriedka.sk/data/files/kotatoxot.pdfIn PDF document text
    • http://ancient-theater.gr/media/file/19190405814.pdfIn PDF document text
    • https://s-oil.hoakhanh.vn/uploads/image/files/93705098388.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/vugijotaberekekiru.pdfIn PDF document text
    • http://tayles.com/uploaded/bamel.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/mejulupazanamik.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/11924218276.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/29050748841.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/ac5f9564c93b51780655b3c88d876e9d/70677568961.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/takavofurepivapupozekaz.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/wosirudaguzaxisakuzubud.pdfIn PDF document text
    • https://spacio.hk/attachment/file/90181160912.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/41848837566.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/zanaki.pdfIn PDF document text
    • https://frutalmente.pt/site/upload/file/36183198857.pdfIn PDF document text
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/79006751666.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/57669102793.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/51676015833.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/vr12pjhs4epjs0fal6dqd4g35s/jivamaxafag.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/61787931578.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=pubg+skins+apkPDF 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_off0000c109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC109 10264 bytes
SHA-256: 21b9879a2e73abe92c9898c18ea6b7dc036adfd53f2b9aa85e07dd492397a37e
font_01_sfnt_off0000d7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F1 19116 bytes
SHA-256: f33865503d12f2f6fdcb9c6eb99959519a978bb2e8025be44cf5021017944358
font_02_sfnt_off0001095e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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