Malicious PDF — malware analysis report

Static analysis result for SHA-256 68afef71950b1917…

MALICIOUS

PDF

83.4 KB Created: 2021-09-14 13:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f5c7663030be74d7750cee705140d02 SHA-1: ab84e5947a652a54e395df444fb3c00d8a9e7eb7 SHA-256: 68afef71950b1917b9e25b4e19bd7c29acd28642bcd80dc8464f3b4a2d6af01c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to other PDF files on distinct domains, fitting the description of a link farm. The heuristic 'PDF_RANDOM_URL_LINK' specifically highlights a link to an algorithmically generated URL, suggesting an attempt to obscure the final destination. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://philabc.ru/uplcv?utm_term=xiaomi+mi+note+10+lite+call+recording
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/juwaremi.pdf
    • https://eko-briketes.lv/userfiles/files/zuxurofutadugufod.pdf
    • https://tsolisp.com/files/file/86228768458.pdf
    • https://rimi.sk/userfiles/file/rejagukawu.pdf
    • http://gibkrakow.pl/uploads/files/16509757640.pdf
    • https://tezerwatch.com/file/upload/files/09-09-23-10-33-17.pdf
    • http://jakpaisanestate.com/images/upload/files/dozaz.pdf
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/dupewodojevilarirewi.pdf
    • http://worldtile.net/jangheung/userfiles/file/xozemilamuxa.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/c862401bda609d6aa09d827e2d537e52/24134811618.pdf
    • https://arabadvertise.com/userfiles/files/wejatizijovamujevonabu.pdf
    • http://topspeed4wd.com/ckfinder/userfiles/files/zazudinigalikuxezaxerude.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16140719d99069---69962547709.pdf
    • http://bpsstudio.hu/uploads/71833075476.pdf
    • http://firmen-bekleidung.at/userfiles/file/tupofuroruxer.pdf
    • http://kleinschadenexperte.com/userfiles/file/vesusodatewedasutapa.pdf
    • http://greatnice.club/updatefiles/file/xutuduvas.pdf
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/fedafalarativilamepufupo.pdf
    • http://gibisch.org/files/files/40973132922.pdf
    • http://phongthuydotho.vn/upload/files/54448750831.pdf
    • http://zhjpharm.com/upload/files/jedibabe.pdf
    • https://lombardpruszkow.pl/local/userfiles/file/telomuwojuw.pdf
    • http://futurepoolandspa.com/ckfinder/userfiles/files/55627365098.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc60.bin
8bf308560137938b13e550d9388913c37906d9a629585d6b5ebc060c6ccc888e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC60 10724 bytes
font_01_sfnt_off0000f4c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C7 16792 bytes
font_02_sfnt_off00010cd9.bin
70f221bc54bb3a5433891657858fefd6b2ee3b72fe7d08bf0d75b332dfae21c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD9 19320 bytes

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