Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ac4b223df4a17d9…

MALICIOUS

PDF

98.5 KB Created: 2021-03-25 04:18:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a229c21141ec62e2e935384e1658870 SHA-1: 631fdc6b96365f9e0744d42b08aea8e5a047f780 SHA-256: 9ac4b223df4a17d99e2458c98460671270469eaf0542ff34ae0ce6f1d459e360
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were directly extracted, the PDF structure and numerous external URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://leonvi.ru/wix?keyword=yugioh+generation+apk+mod
    • http://tertov.xyz/rusosoxosojatzwckp.pdf
    • http://4gusevshop.space/40098476176dfsq4.pdf
    • http://tugrull.com/968741608786g4ht.pdf
    • https://xesefuwaruju.weebly.com/uploads/1/3/6/0/136088059/9ae25dd93.pdf
    • https://rabavuvorek.weebly.com/uploads/1/3/1/0/131070866/bukapaker.pdf
    • http://idealslim-italiaoficial.site/how_to_reset_garage_door_genieog1ux.pdf
    • https://puzagetidorijes.weebly.com/uploads/1/3/4/4/134495880/pononu_bavowamosedomir_desunig.pdf
    • https://zijovegumasapal.weebly.com/uploads/1/3/4/3/134307166/7804702.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://da89e6ec-52f9-4c28-8de8-447a2e923c0c.filesusr.com/ugd/5e5b2a_48d0249d3d434b3981871f7321472b10.pdf?index=true
    • http://joboberunora.rf.gd/16695231208.pdf
    • http://naburonip.myartsonline.com/multisyllabic_words.pdf
    • https://2ddf8be6-044d-4f30-b6fd-16c032829cd6.filesusr.com/ugd/9827ea_e5e8eaa58b1b441fb2582fb84f8868c7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9ac301ed-138c-4924-8d2a-42c4a088b469/2004_yamaha_v_star_1100_service_manual.pdf
    • https://30c0d994-bee2-4d79-bc91-d4aaa7251653.filesusr.com/ugd/0962d9_806dd31579e74c04a480314b523144d9.pdf?index=true
    • http://fuvuxejuv.myartsonline.com/toxawepirokazeve.pdf
    • https://9e730ba1-499c-413e-9a09-8a81f8121270.filesusr.com/ugd/0a0016_85fd0d44d890476d97b0b0d354efd8d9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9db7cdef-5f8b-44ee-abcd-55e802478363/31875222279.pdf
    • http://zusilovame.epizy.com/29641767924.pdf
    • http://rewexukid.epizy.com/195656966.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://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000128d7.bin
40ce0bc9b113ef031639604f059b60aa9f1e41b097d60e75bfbf620cccc66306		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128D7 2900 bytes
font_01_sfnt_off0001331b.bin
60efb889a931cd8ca6937425ea71e78ca76e4bb542126818be31f254c2943fc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1331B 5068 bytes
font_02_sfnt_off00014421.bin
ac5a74c69065c3bdc8018c55c5d6fd9f0f1f73db6a94bd7b625e44cc7fad6742		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14421 12104 bytes
font_03_sfnt_off00016caf.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16CAF 4324 bytes

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