Malicious PDF — malware analysis report

Static analysis result for SHA-256 6044bc47a428189e…

MALICIOUS

PDF

70.7 KB Created: 2021-09-13 19:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: faefd37d5a55d6f236bb8dcacdff8c7e SHA-1: 5ca3dfb55c68e5461766ae1d60fcd3ab45ad56b7 SHA-256: 6044bc47a428189e7fd6db8221c24834e56caa9044b355cc0c1cc0e4d4f30809
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many of which point to potentially malicious or disposable domains, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://agro-pasz.pl/ckfinder/userfiles/files/80200191444.pdf In PDF document text
    • http://telegid.tv/userfiles/files/fujubeguxa.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/306d898fd52045b48deedf18a4a37c71/87678946098.pdfIn PDF document text
    • http://gongin.humenia.com/upload/userfiles/2021/09/files/210906220739.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/24133580884.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/58920809367.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/folowirubetujawuxalemu.pdfIn PDF document text
    • http://kco.su/userfiles/file/80115231687.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/bobadaguzepokusijawe.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138051770df1---54332355827.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/5674463129.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/nofosivegunegijereja.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/82771391569.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/gisaxiridilopudirivu.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/pumomedarubojeboranekit.pdfIn PDF document text
    • http://agavietnam.com/img/files/tozisijusazofufu.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/pukovapakeg.pdfIn PDF document text
    • http://keitbg.com/images/files/vunomepovinofupalixed.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/20489106789.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109082346419636.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/duxajumeretimekopeva.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/saximolepejefowow.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/lezino.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=set+ringtone+android+example+codePDF 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_off0000b30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB30F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB26 10864 bytes
SHA-256: 86bc0dd9d112904db3cf47e48911d712e9e367b2f784b54c7ff99cadcb0f2b7b
font_02_sfnt_off0000e406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE406 15552 bytes
SHA-256: 895763a2cffe45c0fd8975ad759f7e1f251fcec0770ac0e6624938f76d95860a

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