Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb970be149f7ffa9…

MALICIOUS

PDF

96.7 KB Created: 2021-03-27 14:47:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f944d2d4c5ee30fbddc3b7cb41224b10 SHA-1: 7e68e812674f38618ff87bc306a675bfd1f66dfe SHA-256: bb970be149f7ffa96d251ea129207c60e354eecfce1c5cecef066b530b33bb17
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, suggesting a link farm or SEO poisoning tactic. One of the primary URLs, 'https://dafemum.ru/strik?utm_term=merit+badge+worksheet+citizenship+in+the+world', is likely used to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://dafemum.ru/strik?utm_term=merit+badge+worksheet+citizenship+in+the+world
    • https://cdn.sqhk.co/poladejug/JhbBifo/table_tennis_rules_2020.pdf
    • https://cdn.sqhk.co/lidupusumoj/YAzsGgf/vikuwewopimubaxexabed.pdf
    • https://cdn.sqhk.co/tajudozizif/dgi4hcd/kakumofor.pdf
    • http://tapidiv.medianewsonline.com/medical_bacteriology_books.pdf
    • https://cdn.sqhk.co/woxewoxe/9ugd2gu/bitil.pdf
    • http://resokipuga.getenjoyment.net/fapurarixakumukewavopinus.pdf
    • https://cdn.sqhk.co/daxerarugak/gjhdKgf/punifewegulu.pdf
    • http://sijemogezabusa.sportsontheweb.net/91809995795.pdf
    • http://dororuminaxa.mywebcommunity.org/nuwubafowowoso.pdf
    • https://cdn.sqhk.co/tosilura/RghTjao/logo_quiz_level_20_answer.pdf
    • https://cdn.sqhk.co/zidexamuwela/cgg6kLp/kipoxoketutisodanuzimopiw.pdf
    • http://kerutugizuxig.mygamesonline.org/lowrance_elite_4_hdi_price.pdf
    • https://cdn.sqhk.co/zidulibu/KhajcnV/grass_mower_service_price.pdf
    • https://cdn.sqhk.co/letarezetap/gchdjaG/lolegafofapolad.pdf
    • https://cdn.sqhk.co/dubikewe/81tjijd/sovobebevovosozed.pdf
    • https://cdn.sqhk.co/lexoxuxoluvi/iihdJhi/xiraf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xomapagovujux.atwebpages.com/5_languages_of_love_book_price.pdf
    • https://da89e6ec-52f9-4c28-8de8-447a2e923c0c.filesusr.com/ugd/5e5b2a_60480f4633414c4f9bce5f328ed3d95b.pdf?index=true
    • https://cc6d8859-fc08-4100-a073-55b48c5addfc.filesusr.com/ugd/238140_2a206f83860c4951acf68a776e4e4731.pdf?index=true
    • https://49432a94-54bc-4d13-9d12-ea41d731e1b8.filesusr.com/ugd/a7c689_24f728fa12df41e3acc2dcf0fb5c5af1.pdf?index=true
    • https://27158da8-170d-48ca-a528-b8ced62fe517.filesusr.com/ugd/9fc8c3_39de87b50c464899bb0fb5a605cd88e1.pdf?index=true
    • http://lonesopuw.onlinewebshop.net/sududawurizanu.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d72.bin
edea3db26fbd0ae56736ceea5478fa0df307875f88f85a91b74a865a2be677d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D72 5684 bytes
font_01_sfnt_off000130e0.bin
e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130E0 1800 bytes
font_02_sfnt_off0001396e.bin
012e04e0ec18b4f295c934e1acbcf230037a81d47491ddd68eec478f58c052a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1396E 10640 bytes
font_03_sfnt_off00015e05.bin
c0bfd648d5625495c9a06d89189bc0c208196fb6e2754dcfd256414bd7e04c09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15E05 16512 bytes

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