Malicious PDF — malware analysis report

Static analysis result for SHA-256 321d8aeae8fe772e…

MALICIOUS

PDF

75.9 KB Created: 2021-03-29 13:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc5560c5747f9288e22c97e43845f1ab SHA-1: 4af0238720d2d2788035e39ef8fc474393ad1a05 SHA-256: 321d8aeae8fe772eef7f7573ab5bd147140143f0c2c0895f3983c9201914e64a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm or a phishing campaign designed to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the PDF structure itself facilitates the attack.

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://vilenefex.ru/123?utm_term=german+football+reporting+newspaper
    • http://xorabawik.medianewsonline.com/20332983732.pdf
    • http://wepisoja.mypressonline.com/how_to_find_the_limits_of_a_piecewise_function_graphically.pdf
    • https://tagudosalanuku.weebly.com/uploads/1/3/1/4/131452811/kazalugopegezobenode.pdf
    • http://melowimaz.getenjoyment.net/ramayana_story.pdf
    • https://lakimavowowilif.weebly.com/uploads/1/3/4/7/134770541/jezizidesas.pdf
    • https://xoregofejaba.weebly.com/uploads/1/3/4/6/134651656/zunaguzafesizor.pdf
    • https://pesiwuveso.weebly.com/uploads/1/3/5/3/135392822/8e6a78c90.pdf
    • https://lumixomenuvaw.weebly.com/uploads/1/3/4/7/134745504/supuzizu.pdf
    • http://fujuvujazapoko.22web.org/ncert_biology_text_book_class_12.pdf
    • https://xuropowupenuba.weebly.com/uploads/1/3/0/8/130813979/53c4fe.pdf
    • http://lafilubepojev.scienceontheweb.net/75827666281.pdf
    • https://tuxutumixebapi.weebly.com/uploads/1/3/1/4/131438514/a7a9c71e6dbe3.pdf
    • https://cdn.sqhk.co/dodufiruw/smvjjic/conspiracy_of_silence_movie.pdf
    • http://jelesanu.iblogger.org/99376262871.pdf
    • http://mibemuxagegija.mywebcommunity.org/jetulusitixarekiz.pdf
    • https://cdn.sqhk.co/najiligopej/yShcjgk/unmatched_air_traffic_control_airports.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_e7b597cfaa4645beb9371dbad2c9b631.pdf?index=true
    • https://6a9ecc2b-05c3-4056-8705-773ae6be8cdd.filesusr.com/ugd/7a359d_03545c6d112f431dbfc94a853d7da59d.pdf?index=true
    • https://883cd1dc-02d0-4059-8fa2-99201f92b631.filesusr.com/ugd/6166c9_3950537eb837437da449bd15b447a163.pdf?index=true
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_b3bfce29321c499eb675fe2bc46b19bf.pdf?index=true
    • https://0f424234-9c27-4462-a606-4b2ccecf17d8.filesusr.com/ugd/b42a09_e87c060563c346fb8a57428c5c10251c.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_off0000e9bd.bin
653d830e80e153e62072859346c90b345546db111457d0f521dd3c1b82d1b79f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BD 5484 bytes
font_01_sfnt_off0000fc5e.bin
4479dfab4f8c6146d16222514e26f375ed4d34112b2c08d33a317f27549b942f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5E 11400 bytes

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