Malicious PDF — malware analysis report

Static analysis result for SHA-256 55856bf3b2712e01…

MALICIOUS

PDF

78.6 KB Created: 2021-04-13 13:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f88d265e285ad04299e21ccfa9e6033f SHA-1: b0e1ffc8c4de46cb0c6cb2d85c4aae558d296003 SHA-256: 55856bf3b2712e01eb2ad1c05a30cdaa3cc362e916f9ca5e4faee3bebae8cc73
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized domains, suggesting a link farm or phishing lure. The primary malicious URL, https://xezojetit.ru/strik?utm_term=a+series+of+unfortunate+events+season+3+actors, is presented as a redirector, likely leading to a phishing page or malware download. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://xezojetit.ru/strik?utm_term=a+series+of+unfortunate+events+season+3+actors PDF link annotation
    • http://zhenskiizhurnal.ru/zidipevj9fs0.pdfIn PDF document text
    • http://kukushpa.fun/90628214353632hd.pdfIn PDF document text
    • http://tunewejewuz.mypressonline.com/arquitectura_romana_caracteristicas_constructivas.pdfIn PDF document text
    • http://mizejodaf.mywebcommunity.org/participatory_monitoring_and_evaluation.pdfIn PDF document text
    • http://wacc-cat.org/17997043741ncixt.pdfIn PDF document text
    • http://kmikaerfs.ru/38810773649b50f2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mukut/transunion_free_credit_report_uk.pdfIn PDF document text
    • http://zujapataluzipo.epizy.com/nuzuxobedifedakodi.pdfIn PDF document text
    • http://sisawujeza.rf.gd/53965311517.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/asm_metal_handbook_vol_19.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/22990644051.pdfIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/que_son_las_lineas_del_tiempo_y_para_que_sirven.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/is_the_nutribullet_really_better_than_the_magic_bullet.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/35263648713.pdfIn PDF document text
    • http://rosajeku.myartsonline.com/bulletproof_problem_solving_free.pdfIn PDF document text
    • https://67d298e0-85f4-4ad4-bf36-e1ac857e42fc.filesusr.com/ugd/b6bf5b_1161907350874418bed81f6adc099ba4.pdf?index=trueIn PDF document text
    • http://linexiziretewoj.rf.gd/palasunuxasofuxaxi.pdfIn PDF document text
    • https://1923692e-f727-4f58-80a8-3583160180e3.filesusr.com/ugd/c4ccc4_2d9f625c11e747c3998d3e1d367d25c3.pdf?index=trueIn PDF document text
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_c22d99fbaa7f43e1b3d2fb438181bd68.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tobaziw/lights_out_2016_movie_download.pdfIn PDF document text
    • https://s3.amazonaws.com/zatasipezeg/24828905694.pdfIn PDF document text
    • https://45ed8376-e832-497f-ab20-0a31924dc5db.filesusr.com/ugd/4b7290_8f00cb495ac648c7803bad61b9c19732.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gomakobez/zetaxanotalezefe.pdfIn PDF document text
    • http://sajulugebimisu.myartsonline.com/guvupapegu.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/tofinimoresefafelugijeve.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B2 5056 bytes
SHA-256: 6d21ef4d8333c46f8e24a43984cb2484c4e2e20920f3c7feb36287dde2737257
font_01_sfnt_off000107f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F7 10764 bytes
SHA-256: d5b69caea60a5e86a73f4ca48a4d2ac960834da8314abee90c27c806b98e081c

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