Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b5e9a0f55789f1…

MALICIOUS

PDF

78.2 KB Created: 2021-03-29 00:16:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1649a80d037d8cfffabe725f31158986 SHA-1: 2324dfc27561455da8e4a4ae570999d89afd6dd1 SHA-256: f3b5e9a0f55789f1c7f5700d5541e7bc49ec8fca7af8e05f2a8d17ed8c8e7bcb
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO abuse tactic to distribute malicious content. The document body, though heavily obfuscated, contains elements related to a book title and authoring application, likely serving as a lure to encourage users to click on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jottigo.ru/award?keyword=appelle+moi+par+ton+nom+livre+pdf
    • https://cdn-cms.f-static.net/uploads/4377102/normal_6041a90d8911c.pdf
    • https://ginadilu.weebly.com/uploads/1/3/4/7/134768391/tafijuduv_zuvidit_nozulobebo.pdf
    • https://weroxodadugofu.weebly.com/uploads/1/3/4/5/134503620/7429805.pdf
    • https://cdn-cms.f-static.net/uploads/4459463/normal_601f78a17b8f8.pdf
    • https://xerogovelexukep.weebly.com/uploads/1/3/1/6/131636665/nazufiruval.pdf
    • http://hookup755.fun/my_hero_academia_two_heroes_freeje718.pdf
    • http://xrootunited.com/how_to_jump_start_a_riding_lawn_mower_batteryqel5y.pdf
    • https://fuzefiwojagolo.weebly.com/uploads/1/3/5/3/135308179/texobutedikazo-barik.pdf
    • http://afracheat6.xyz/how_long_to_cook_chicken_burgers_on_george_foreman_grilluw6dj.pdf
    • http://itayoga.space/galexajowuvolilopafoxafekwl3z8.pdf
    • https://fobaripiso.weebly.com/uploads/1/3/4/4/134443650/nadagixurojevil-pebotudebe-lexud-voximebemixago.pdf
    • https://cdn.sqhk.co/xalurubizud/jihfAhe/natosiw.pdf
    • https://cdn.sqhk.co/faruzikako/0HWWIia/transformers_prime_fanfiction_arcee_and_bumblebee_lemon.pdf
    • https://cdn-cms.f-static.net/uploads/4481847/normal_5fe7b20fb19f7.pdf
    • https://penugevofubelig.weebly.com/uploads/1/3/1/1/131164238/lelebofigexoxelonagu.pdf
    • https://mavujaxubuxabo.weebly.com/uploads/1/3/0/7/130775304/panavazituzadew_naxas_xuwara_moxamabav.pdf
    • https://xadijonoru.weebly.com/uploads/1/3/3/9/133997446/vatavusogo.pdf
    • https://cdn.sqhk.co/lalusozokigi/if8gghd/47473162245.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f730d15c-1921-46d2-b6d4-288333e40990.filesusr.com/ugd/e2c223_720d0c55ed964ab9be0675ed65c578fc.pdf?index=true
    • https://de99c131-68bf-4271-bcef-cda292486844.filesusr.com/ugd/f5892c_ecf700df3b1744cd9323e8afabd8beab.pdf?index=true
    • https://d52aed46-be45-4f9b-8106-cf6fc7ee66c0.filesusr.com/ugd/b148e5_65ddd45643524f7a8fec3d3004bcd6d9.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f20e.bin
ae5667fb52558269d1176f0b8c033ce7ba2641ed5f263394392d8f5512e9eb24		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF20E 5060 bytes
font_01_sfnt_off00010334.bin
dbf82911f07a963886648ae427f711e5abe521b640cf8f9b18b50f3de344d1d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10334 12588 bytes

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