Malicious PDF — malware analysis report

Static analysis result for SHA-256 166d9f76e6c887fa…

MALICIOUS

PDF

85.1 KB Created: 2021-09-09 10:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d042906ed906dd88bc3e3b43c1d9e51c SHA-1: aa5104332e2b13ee4941f3913429f8ee4bd16027 SHA-256: 166d9f76e6c887fac4e94372e97ba0503a23e43a20a2a12105093c7b9b61d2cb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://crewmak.ru/uplcv?utm_term=cars+fast+as+lightning+mcqueen+mod+apk
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/hleuor3l3sbcsspf16j3ovi27s/12517386893.pdf
    • http://ghettaetamionarchitetti.it/userfiles/files/rekipaxidonase.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/67d311458db9a230e093dec14ef29a6d/pazulel.pdf
    • https://themis-lex.com/userfiles/files/63210790606.pdf
    • http://stl-hk.net/userfiles/renese.pdf
    • http://ageddfjtj.pretty-match.com/upload/files/dokoxatamaguwepujuwuri.pdf
    • http://maszyny.pl/userfiles/file/relofuvezoduvin.pdf
    • http://dasbluemchen.com/potek.pdf
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/96848896137.pdf
    • http://thietbiantoanttk.com/uploads/files/gikukexosix.pdf
    • http://gallery4walls.com/upload/editer/file/jitoj.pdf
    • http://dztechfin.com/upload/file///tatofanizobitikunosi.pdf
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/72824839866.pdf
    • https://davidfoleyinc.com/userfiles/file/58130007828.pdf
    • http://recko.ru/ckfinder/userfiles/files/gulone.pdf
    • http://travelbilet.ru/sites/default/files/file/rajirumesasu.pdf
    • http://www.gulbaharsigorta.com/contentData/file/xafepasidibatagoj.pdf
    • http://fskyok.com/uploadfile/files/ruwupujisavufenezaxivaz.pdf
    • http://sonarkella.com/userfiles/file/vudajavodapufabojosizalup.pdf
    • http://istanbulballoons.com/ckfinder/userfiles/files/kelevaduxebupatewi.pdf
    • https://thai-airpark.com/ckfinder/userfiles/files/24394551032.pdf
    • https://szabobuszrendeles.hu/files/files/ratiguvugipozon.pdf
    • https://ln80.cn/filespath/files/20210905111352.pdf
    • http://www.aportecnica.com/imagenes/editor/file/73775720818.pdf
    • https://vcvscr.cz/www/www/fckphotos/file/bonepimata.pdf
    • https://cnc-ar.ro/files/file/busosowaxoxamenure.pdf
    • http://cgl.lu/userfiles/files/xebomirelufamobu.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_off0000d80a.bin
4794f718394a339953e2480e5332532575d61d34b40caa257f0ffa94a6fe6ba0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD80A 23312 bytes
font_01_sfnt_off000113bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113BB 16792 bytes
font_02_sfnt_off00012bd2.bin
03b5eae67b7888ca84a0b807e5fdefb5566c48cf6cb591adce307d8d0130ad33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD2 11436 bytes

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