Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd5ac63721409e6…

MALICIOUS

PDF

79.4 KB Created: 2021-03-18 17:01:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13c1a47f01019883c08c401753ac9643 SHA-1: 76c411794dcc3579f50ac1b460a02521eca9a317 SHA-256: 4dd5ac63721409e6fd05b38270bbc9eb9307340b915c549b7d189b229da547b6
156 Risk Score

Malware Insights

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

This PDF file, generated by wkhtmltopdf, contains numerous external links, a common tactic for SEO spam and phishing. The primary URL, 'https://ponafet.ru/wix?keyword=khan+academy+math+answers', impersonates educational content to lure victims. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ponafet.ru/wix?keyword=khan+academy+math+answers
    • http://sotipidikukunow.getenjoyment.net/tableau_lod_expressions_tutorialspoint.pdf
    • https://cdn-cms.f-static.net/uploads/4493553/normal_604734add162b.pdf
    • https://cdn.sqhk.co/jekidase/3rkqiPp/daxubobanizobataruxire.pdf
    • https://cdn.sqhk.co/zotofoza/XIJ1jeW/64183866531.pdf
    • https://cdn-cms.f-static.net/uploads/4443610/normal_6013b9be18a53.pdf
    • https://cdn.sqhk.co/jujirepak/0Aie5jf/vowinakajojorepi.pdf
    • https://cdn.sqhk.co/limizolaxa/ehdpFwX/95718544246.pdf
    • https://cdn-cms.f-static.net/uploads/4465131/normal_5fe7a39321fbb.pdf
    • https://static.s123-cdn-static.com/uploads/4420237/normal_5fca0d0caff92.pdf
    • http://nasufulorejuwe.mywebcommunity.org/20022609918.pdf
    • https://cdn-cms.f-static.net/uploads/4418556/normal_5fd1c3eec1cc8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dusined/20375621033.pdf
    • https://662517ce-f374-4037-aebd-99b1dbe00103.filesusr.com/ugd/0c4177_e990e820c6fd4bdf9307d9432319c7fd.pdf?index=true
    • https://s3.amazonaws.com/xalexojaxipud/43558784190.pdf
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_9f8f04504c58499f9f86f878a02aa8fe.pdf?index=true
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_ef3f4a3f402244ffaf74658505dff0b7.pdf?index=true
    • https://1c92f6d8-19eb-429c-9239-1cf6be91372f.filesusr.com/ugd/cc1a03_af0d72c486994e1591ef1d4ae48247e1.pdf?index=true
    • https://d99d9bf7-a5e0-49f2-90ac-0d1bc881463d.filesusr.com/ugd/0182ef_e824a46f05154483a82b6f9c117fb93c.pdf?index=true
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_d4857d3e429f4138b84f6fd84c42cf4f.pdf?index=true
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_cc21f8440c6a45e49807d26e1b233e83.pdf?index=true
    • https://s3.amazonaws.com/ganubatebedoxez/is_motion_to_dismiss_a_responsive_pleading.pdf
    • https://b5f169ef-6bcf-4d19-a24b-32bdc9dd7a5f.filesusr.com/ugd/2e79a6_3643abdde1334182ac8014d0a2b9e0ae.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://www.hemingwayapp.com:��This
    • 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_off0000e1a1.bin
f6269d15a158ffacf7122535e7571e29faf9bdba6870bb486da77212fe275ffe
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A1 5308 bytes
font_01_sfnt_off0000f3a2.bin
c2efd14ec08698479f2094f1ac400b39c3b1097dbe7fad011e756fe89dedac8c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A2 10916 bytes
font_02_sfnt_off00011927.bin
49bb1087c84d8682ae87f8a8f02cb5f1dc19280eb2fc3a2b35905785baaeb355
pdf-font-stream PDF embedded font (sfnt) at offset 0x11927 16276 bytes