Malicious PDF — malware analysis report

Static analysis result for SHA-256 da27340c23509ace…

MALICIOUS

PDF

81.0 KB Created: 2021-04-08 22:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2138ac4098203015399aef3c9664481e SHA-1: f37257c080ff7d3f057b952ca333c2e97278d165 SHA-256: da27340c23509ace34083f2446fc8b9e14fe847642b29a54a00a615cd1b9b03c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, specifically flagged as a phishing trojan. It contains a large number of external links, with one prominent URL pointing to a suspicious domain ('golowaki.ru'). The PDF structure suggests it's generated by wkhtmltopdf, and the presence of numerous external links indicates a potential link farm or redirection mechanism to host malicious content or phishing pages. No scripts were extracted, but the overall structure and link distribution strongly suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://golowaki.ru/strik?utm_term=lista+de+verbos+en+ingles+en+pasado+simple+y+pasado+continuo PDF link annotation
    • https://cdn.sqhk.co/melipetoluf/CihSPnN/gawegumikota.pdfIn PDF document text
    • http://tesugujinarijag.mywebcommunity.org/o_que_comer_para_no_engordar_na_menopausa.pdfIn PDF document text
    • https://cdn.sqhk.co/waketeni/ahfbOhf/samurai_2_vengeance_1._3._0_apk_download.pdfIn PDF document text
    • http://rezanufeku.mygamesonline.org/dedaxewirimaxesoler.pdfIn PDF document text
    • http://xufuxenu.mypressonline.com/52975752417.pdfIn PDF document text
    • http://kojijeku.mygamesonline.org/23859473507.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://4abf464d-34d5-4c80-8de5-e64f30e04530.filesusr.com/ugd/8b3eb5_3de2c27083654c30837bbf37b0fcc486.pdf?index=trueIn PDF document text
    • http://movuzawizigevej.myartsonline.com/burrows_and_badgers_rules.pdfIn PDF document text
    • https://07e0a16e-b77d-475b-b724-88bbaedb347c.filesusr.com/ugd/8e9e2f_20ea22e3bfbd405bb9afd7e1dd4a04be.pdf?index=trueIn PDF document text
    • https://f9a132f0-acc9-4761-b7d8-38025aedd849.filesusr.com/ugd/5c71d6_4b4b819e875e47cb95ad6c10c3724490.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/miretatibojulofewokil.pdfIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/lightning_mcqueen_3d_cake_template.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/smash_bros_everyone_is_here_meme_template.pdfIn PDF document text
    • https://9005981c-20a7-4b93-9dfe-a591c0bc6fcf.filesusr.com/ugd/afbba5_4d423d52cd584400b728dcf2283079f0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/lunivopegifarif.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/vefifatetebuz.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/22135792861.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/sugupawadasopufaba.pdfIn PDF document text
    • https://7ce190f9-fb8d-496c-a51a-ce151dcc024a.filesusr.com/ugd/e72def_b89e4ba14347485d99dbc29f44b0d3e1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/17010825533.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF2 5516 bytes
SHA-256: d4dd3b3c83b067348dcf39b2c50e7d7c20ae3998b57cb785aec5aa2bab7d3a0a
font_01_sfnt_off0000ff99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF99 11804 bytes
SHA-256: cd9a22653689e1a2eaf17bf33afccd0e5e81c10782a1c35a004efa2da2746867
font_02_sfnt_off0001261f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261F 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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