Malicious PDF — malware analysis report

Static analysis result for SHA-256 16008378f650d8c9…

MALICIOUS

PDF

72.6 KB Created: 2021-09-26 17:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aa406326870bd68b5a64fe0ca4797c81 SHA-1: 2abca97f5cd5d935c268778d78bacdeed5c36695 SHA-256: 16008378f650d8c99b445eaa0aba70d9fcfec12cf6e8af5cfd3f2cdbe8e9dbaf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. The PDF contains a large number of external links pointing to various domains, many of which appear to be disposable or used for hosting PDF files. This suggests a campaign to lure users to malicious content, likely for phishing or further malware distribution. No scripts were extracted, but the structure and numerous external links are indicative of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://irlanc.ru/uplcv?utm_term=how+to+update+my+android+tablet
    • https://papersacksfactory.ae/images/bulk_images/files/rorupozozobofofijur.pdf
    • http://yalcinsezer.com/upload/ckfinder/files/dositog.pdf
    • https://technoarc.net/userfiles/file/kefuribagozedewokugut.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/81780a25d903d0bf64fde6fe22550241/pojoxoborabi.pdf
    • http://pietrek.com/MARCUS/files/file/30979449289.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/e5hvgc292eub8q1dgng55coih3/20678090435.pdf
    • http://sakesushilakehavasu.com/uploads/files/juranabereraranobulepu.pdf
    • http://poongdung.com/FileData/ckfinder/files/20210909_4C300E118A83B2E9.pdf
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/1724428109.pdf
    • http://maroba-zirndorf.de/file/labisunatakaxexupatuximez.pdf
    • https://rossbeede.com/userfiles/file/butumodapewenagu.pdf
    • http://theclubburger.com/uploads/files/wekopenaxirevifu.pdf
    • http://tech-in.info/bramy/userfiles/file/26005869950.pdf
    • http://midel.me/userfiles/file/tidujimaxoxelupana.pdf
    • https://reha.bg/content/upload/file/jiwizaso.pdf
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/44788958358.pdf
    • http://msnladyboy.com/ckfinder/userfiles/files/80609178168.pdf
    • http://whipitleather.com/userfiles/file/zalapizunudazebosegilore.pdf
    • https://xlspandoek.nl/userfiles/file/rusonegomafaxabegomivo.pdf
    • https://deverfgrossiercms.deindrukdemo.nl/upload/files/naronuzilasajusipesade.pdf
    • http://barbusci.it/maisUserFile/file/jemijosubumuwinut.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_off0000b51f.bin
4a15c94052ac504f895eecc60eba0b153fb799412c10a9e647ace82105deb51a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB51F 18568 bytes
font_01_sfnt_off0000e4a5.bin
3a887a2ce62cd7c89f17bc8799abf6e30acdde9c546f3c2ea4621ce910895448		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A5 10816 bytes
font_02_sfnt_off0000fd53.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD53 16792 bytes

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