Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3e9ae1ca53d8b66…

MALICIOUS

PDF

79.3 KB Created: 2021-09-16 17:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cea3054e5c10c1a88d356a62b97cbc22 SHA-1: a7aad8efdbd709004fc2b7e60eeb7ed2a756fdea SHA-256: b3e9ae1ca53d8b66df363351b34a4b44ce9f89196d0441341c1db8a808d4fa5a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to malicious sites or download further payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or scamming operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://irlanc.ru/uplcv?utm_term=stb+emu+pro+apk+free+download PDF link annotation
    • http://3wsystems.com/shipinc/userfiles/files/surupomuz.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/wezafadewolamabivurumij.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210901_2EA3E94E5440CE7F.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/83043746030.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/foloxadezapilijev.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/41094435689.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/sagopinefijalomakaka.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/befafujorivitugawakixeluk.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/80960922870.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/58993116369.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/18714095781.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/kurivadixefexilidanalox.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135cc0012a5c---23909285234.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/penobixokaj.pdfIn PDF document text
    • http://vanhacollection.com/images/files/benalenuworapup.pdfIn PDF document text
    • http://myarchitect.es/ckfinder/userfiles/files/ranogupedozoforuti.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/qn39hqp8751d114tre2cjc85t1/kekobe.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/58851140960.pdfIn PDF document text
    • https://latework.cz/soubory/87569885720.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/kefaniroxige.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/gilokubazariza.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/xisemejivotudukufikafewi.pdfIn PDF document text
    • https://ratodua.com/contents/files/94682388466.pdfIn PDF document text
    • http://wiki.stbemu.comIn 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_off0000d0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C2 17656 bytes
SHA-256: e8c5bb0952a9cd6b6a6dfb105f04182f67c380ce047a890d57cce5758142ffb0
font_02_sfnt_off00011660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11660 10892 bytes
SHA-256: e9d39dde45b9c52ba8e8b924c1ff5fd6416ea1910a37eeffd9446db1b7ccd8cc

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