Malicious PDF — malware analysis report

Static analysis result for SHA-256 44e209ed0239927f…

MALICIOUS

PDF

81.2 KB Created: 2021-09-10 10:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fd9ce7fb8b6fd82f06585c98f36d8472 SHA-1: 152712f359e08f1e60cf6738333d9c8ae0f3fe2c SHA-256: 44e209ed0239927f6808f74923a03d7d3cd30e236098323a0297b32503cc4f58
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to distinct, disposable hosts, suggesting a tactic to distribute malicious content or phish for credentials. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://traffictkt.com/viking1/uploads/files/zupifosotugonuxagen.pdf In PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/gefarenesibatuna.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/zomutijajikagak.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/bivaxosi.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/fifutil.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210906134721.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/42129798087.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/vujakufinenabifawavipiku.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/41820033393.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/zikaxudoraxipures.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/pasodenubawoxurajanad.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fed38247fa---93605143677.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/37372679659.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/53165422160.pdfIn PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/34328877471.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/57602955731.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/fibavamajavaburadoguvan.pdfIn PDF document text
    • http://novafish.it/userfiles/files/pojamegekofonofuranot.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/finonewutenibupevomedejig.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/xofosejuxafujugobegar.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/daxuwopimufuvezi.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/67739024028.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/76288097552.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/ferugepapajivo.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/rupaxaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=switch+java+android+studioPDF 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_off0000d6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A2 18324 bytes
SHA-256: c54a7cc66b5a36e355e9c20896c883eb89d0dc15bd1e31fe6b16dde33e5a6acb
font_01_sfnt_off000106b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B6 10744 bytes
SHA-256: 615f2de46e40baa656d736627f1958a9472afc914fde80b9ad10b3c986fc6623
font_02_sfnt_off00011f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1