Malicious PDF — malware analysis report

Static analysis result for SHA-256 255b7235b4277c59…

MALICIOUS

PDF

68.2 KB Created: 2021-02-24 11:50:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8fbd4a1efbc4d2081e0a0f0f53cae633 SHA-1: 72ea92a2c98a09e65cb5f597c83cb7f608c4e57d SHA-256: 255b7235b4277c59120d7a9591b410f510e50924f463283d4ff99e2ad563d7ee
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier. It contains a link to a known malicious redirector, https://yafferge.ru/strik?utm_term=100+a%25C3%25B1os+de+soledad+traducido+al+ingles, which likely serves as a lure to download further malicious content. The document body, though heavily obfuscated, suggests a phishing or scam attempt by mimicking search results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://yafferge.ru/strik?utm_term=100+a%25C3%25B1os+de+soledad+traducido+al+ingles In PDF document text
    • https://cdn.sqhk.co/noruwotil/Ghiahav/xeruruboxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388285/normal_60279e5fab99a.pdfIn PDF document text
    • https://cdn.sqhk.co/malevevipali/eBibge3/good_drift_car_forza_horizon_4.pdfIn PDF document text
    • https://cdn.sqhk.co/dabozijide/Jlggihb/radedakulumulebaneleju.pdfIn PDF document text
    • https://cdn.sqhk.co/duwokarewesu/dicjcg7/1100763816.pdfIn PDF document text
    • https://cdn.sqhk.co/jotenitix/2hbzugi/87486315937.pdfIn PDF document text
    • https://cdn.sqhk.co/vimexuda/nhfifqY/who_information_on_masks.pdfIn PDF document text
    • https://cdn.sqhk.co/xojelumegasi/Wlmnwii/warhammer_age_of_sigmar_realm_war.pdfIn PDF document text
    • https://cdn.sqhk.co/lidupusumoj/jel3vja/texas_holdem_poker_offline_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/nilofixogezu/c7CjgoN/crystal_islands_spyro_key.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411717/normal_5fd330ea55d7f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389104/normal_600741c792a3e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368497/normal_5fe50b91494d8.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/kegovev/82291610460.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/samsung_note_10_amazon_quiz_answers.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_off0000c901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC901 5416 bytes
SHA-256: e035124c4676d25748357c3c35ce43aaa397ad8a55f88f2ff8063783713d7e2c
font_01_sfnt_off0000db39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB39 11776 bytes
SHA-256: c2753a1e9d6508ba729d8ed7e4f2beef81740794132d80ef83b7de43befd4904

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