Malicious PDF — malware analysis report

Static analysis result for SHA-256 9876a6637054142e…

MALICIOUS

PDF

79.2 KB Created: 2021-09-13 23:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d8731f5d1862c6db91a418bcc6fbda84 SHA-1: c37d521d2d61b95cab2f4d0dca85ca263cd8c328 SHA-256: 9876a6637054142e13c564aa46ecca2e5dcddfa1d283e13c7abf5cb903ee1492
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on disposable domains, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF format and the presence of external links are consistent with techniques used to deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://inwebjor.ru/uplcv?utm_term=psu+calculator+basic
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/89612863366.pdf
    • http://89928386.com/uploads/files/202109021052007005.pdf
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7663594048.pdf
    • https://ijtm.in/userfiles/file/13434326320.pdf
    • http://bimbrlata.cz/UserFiles/File/78469714023.pdf
    • https://dalton-english.com/userfiles/file/finusuvavokilof.pdf
    • http://lightofislamonair.org/uploads/files/35071780920.pdf
    • http://rotarycochinharbour.org/ci/userfiles/files/96265741990.pdf
    • https://crownprolaw.com/userfiles/Proj_Name/files/82921547290.pdf
    • https://studiovizia.com/webroot/img/content/files/87441950268.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/5llmrvjf91e62mfaoi14u307c9/78209417681.pdf
    • http://conomiya.com/images/uploadedimages/file/jixibugodofinakasejaromez.pdf
    • https://thietkewebseo.com/webroot/img/files/mugela.pdf
    • http://deepakbatteries.com/uploads/file/29262548898.pdf
    • http://zlzljc.com/uploadfile/file///2021090208465251.pdf
    • http://ossokahve.com/upload/file/33770112753.pdf
    • https://rivieresoceanie.com/userfiles/file/pijidinexeravopefase.pdf
    • http://ivankrivanek.com/userfiles/file/feximedinarif.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/9dc85a17aa386069621fb93c209d58a3/77572819165.pdf
    • http://ebbers-schilderwerken.nl/uploads/files/30012663522.pdf
    • http://short-story.ru/upload/file/48460391037.pdf
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/28534704382.pdf
    • https://tipresentoio.it/images/file/87365247540.pdf
    • https://tlkingatlan.hu/kepek/other/file/lolenibubusev.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_off0000d2d8.bin
2fe12ee41e5b54b7e4096aa90a397c2cf59072aa7f6197e9d32f3a8021a9953b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D8 10228 bytes
font_01_sfnt_off0000e9fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FB 16792 bytes
font_02_sfnt_off0001020d.bin
57af4255a3d5dc8e1881fe1de854686ebd529b1692b11f65daaa5fa904c037f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1020D 17552 bytes

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