Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2276a5a4ff80415…

MALICIOUS

PDF

81.1 KB Created: 2021-03-19 14:22:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f60a466d7055dad32384989639eeafb SHA-1: 25e2b7d96382ca28abcf11165411f936ecf82361 SHA-256: f2276a5a4ff80415c52a6afae8c5053258ba59b924e9f9e884ba0ba0a267ca6c
156 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which are dynamically generated, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jacksth.ru/strik?utm_term=the+game+plan+2008+dvd
    • https://cdn.sqhk.co/mivuxakadu/wKfgdhd/tisadomepuberoke.pdf
    • https://cdn.sqhk.co/leluforeref/CPgjZlK/89365078964.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_3214332401ed4311be3bf500875dae17.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2cf4418a-1ff8-4cbc-ae09-26db92b017cd/best_5th_edition_dd_books.pdf
    • https://6f84c080-6bd2-4154-8ce1-0e390380bda5.filesusr.com/ugd/defdb4_605d475e2c834aa7b504610f0195fdb7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7abbedf1-0596-496d-8973-176e47646c7d/how_to_prove_congruent_triangles_sas.pdf
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_8b8571a41637436eb1a61651f53b0f4c.pdf?index=true
    • https://1ce8651a-bfbb-4b9a-b1bf-24b3b574775a.filesusr.com/ugd/ac72e0_164156a6a62f4db4bc0dc3dcf86dc23a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7d867b01-22c3-4668-ae19-2dc736ae9747/how_to_value_real_estate_stocks.pdf
    • https://ede36962-9452-4451-b182-fa4236ba9bc6.filesusr.com/ugd/83b1b3_3cdda9164624442699cd08a788b1cbc4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/93be69e7-dba4-4e3b-bd6e-5f231da81744/72961355410.pdf
    • https://uploads.strikinglycdn.com/files/2c9be2bd-0fdc-47c3-a887-ae262c3ec491/fatigaxulifurasefobe.pdf
    • https://18b62485-dce0-4e35-9712-b1d1f13fcb23.filesusr.com/ugd/296484_6ea1c5f70e884d19b498305d2cc68d4f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3732b84d-c0e5-4ac8-869c-2830b7bc4cda/bosch_super_silence_plus_42_dba_not_drying.pdf
    • https://8a7e94d2-1b07-4399-8a7b-cfebf1eb419e.filesusr.com/ugd/e78b77_1a7e5e5985b2438ab691cf4ac1e9034f.pdf?index=true
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_76dd5b8d5a704462a3619e1cad43f622.pdf?index=true
    • https://a86a6b26-b473-4b55-b9aa-7628a2bff077.filesusr.com/ugd/4f270c_f6d9ba8fb38a4ca3820cf2cfabe1d8bd.pdf?index=true
    • https://4f0f5a39-0a2f-4cdf-b4e4-40a644fad8b9.filesusr.com/ugd/2024fe_f4931f77c87847e5b699d353da4eed10.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d4c2c8be-0fc3-4c8e-b101-1f3fdeda368e/pmp_certification_book.pdf
    • https://uploads.strikinglycdn.com/files/7859c4d2-93d8-4f07-a0ee-7e6dce62cd6c/84152865043.pdf
    • https://uploads.strikinglycdn.com/files/6960d891-ebb1-45c9-adc6-262f234dd0ac/what_is_a_onyx.pdf
    • https://e432c3f7-acc0-403b-bc7f-1b8c16782643.filesusr.com/ugd/6a4899_3ba65bfc512d497e8f5a13b4c758251e.pdf?index=true
    • https://b7e73dfe-ad35-4791-b4f7-7500f5b7882c.filesusr.com/ugd/bc79a4_16861cc9a6c04beea71fe1c775d5248b.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_off0000fbcf.bin
e468fe805ae85f77214e14c854179fd8378192be31acf0599aff08fd2f50c9b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCF 5576 bytes
font_01_sfnt_off00010ea9.bin
41382a31c20b935871b791c6651606f08ffe6cc1865bc259be4db1144fc8a318		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA9 12044 bytes

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