Malicious PDF — malware analysis report

Static analysis result for SHA-256 45851f22b358052d…

MALICIOUS

PDF

81.4 KB Created: 2021-03-29 04:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 407fd896499336749de5328d123d1069 SHA-1: 477b0456a0924a249b0bff2901fc6ffbb35d09c3 SHA-256: 45851f22b358052d717abf19deaf0f926dac92e914bb0d9f2bf77c80113f4f62
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically pointing to a suspicious domain ('jacksth.ru') that is likely part of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of many external links suggests the PDF is designed to redirect the user to malicious content, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/award?keyword=bascule+jk+exercice+corrig%25C3%25A9+pdf
    • http://leporabev.mywebcommunity.org/what_is_the_exterior_angle_of_a_regular_polygon_with_30_sides.pdf
    • http://xolokeminapi.getenjoyment.net/47846023052.pdf
    • http://motorutovibipe.sportsontheweb.net/80885096707.pdf
    • https://cdn.sqhk.co/nowagenika/jcgHXJp/72189890761.pdf
    • http://volupixo.mygamesonline.org/eupsittula_canicularis.pdf
    • https://cdn.sqhk.co/modonasuje/Y7lTLhb/31116041236.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://55afd15b-9a96-48ff-beb6-d705f4765584.filesusr.com/ugd/8b06a9_1359661cd9744de487c691acdd825994.pdf?index=true
    • https://c559a41a-09be-4e62-b9ef-eb02439c3bab.filesusr.com/ugd/b0b521_d1de9830347f418794557ec55cf01edb.pdf?index=true
    • https://s3.amazonaws.com/wutogugej/chromecast_extension_free.pdf
    • https://cf587a47-7c2f-4f55-8bbb-21a4c73503f7.filesusr.com/ugd/8ea597_fe9b2991523048ddb4af486951175f94.pdf?index=true
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_9f5805c9f5974736be7fb8340004e92c.pdf?index=true
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_e3668b0ae21e43cf88b10b4d2e0812db.pdf?index=true
    • https://s3.amazonaws.com/kezemiradigu/bulagadojefexoxe.pdf
    • https://acfc0e76-311d-46af-9c13-f46c112eb424.filesusr.com/ugd/f90bad_a9a276b7be7744d6bac4f7748d3eafcb.pdf?index=true
    • https://7a48fde5-f9d1-4ce4-84a2-8b156d245d18.filesusr.com/ugd/8127dd_a1deb1052be2418ea9a54bde9a87398a.pdf?index=true
    • https://9f1be152-2ea1-4306-981d-bfff62ad382d.filesusr.com/ugd/08fb22_0eb33980f407486a8821b4e48b7663e2.pdf?index=true
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_06b07a7bbfcb47fd9e624c26d173e5f4.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e77b.bin
e802d858c944e5ea99b4536b208cec1c7bc7d505b1c6bab2f7a15c628f84a6d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE77B 5720 bytes
font_01_sfnt_off0000fad2.bin
cadb1f49104f5dae0bcc03db3f33ca68830bf47f1144b5eb9106323e7ca875a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD2 11860 bytes
font_02_sfnt_off00012106.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12106 16204 bytes

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