Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f0fd5c8eca566ba…

MALICIOUS

PDF

84.7 KB Created: 2021-09-13 19:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8801182ebde9e32336d10c4132e70359 SHA-1: 4a8511e04e021867bf58a7c09e28f628fc641fc4 SHA-256: 4f0fd5c8eca566ba155a7f11d6989d44ab39ee334037fffd2ed9cffa08ca66a4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=watch+a+quiet+place+part+2+online PDF link annotation
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/94851599716.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/32627828902.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109020915569274.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/24770406659.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/jofujal.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/kaxupesepiditagim.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/90904380005.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/nikubepepupesovaruz.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/pevorinuvezagod.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/toxezerilirevefudebetamin.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/rafazowetiremexoler.pdfIn PDF document text
    • https://collinite.pl/userfiles/file/regujowanoma.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/61332969034.pdfIn PDF document text
    • http://agama-rc.com/upload/files/bivodesoboruvivozokaw.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/12496696226.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/1690895020.pdfIn PDF document text
    • https://datawire.gr/files/files/mapirojoler.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/71614156959.pdfIn PDF document text
    • http://elitacasa.it/images/file/vebiguwovopuzi.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/nuvedagalekipugive.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/zonogogugi.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/061121426357.pdfIn PDF document text
    • https://mimpidia.com/contents/files/ravajisudebidudotax.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/govowuwi.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_off0000e61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61E 18176 bytes
SHA-256: 772323c2bec98e3b140f5a970b4fb4663195b2e1b3a85d9a012aaccddb923e0d
font_01_sfnt_off000114e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CFE 10660 bytes
SHA-256: 6c7ba29a325cc1fea6dccbf16c4a28a88db7756ab9f3ed68621b57bec3dca574

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