Malicious PDF — malware analysis report

Static analysis result for SHA-256 aab98844a3c9f8e2…

MALICIOUS

PDF

73.9 KB Created: 2021-02-22 20:10:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a6e8a365fdd061011694c9bbbe4edeb0 SHA-1: 0c28562c78f7399e591556a9e2b6c3f940d55343 SHA-256: aab98844a3c9f8e26895b769ffd4d17d688b24559fe8a3a42ca54f24788f474b
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with one specifically identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a strong attempt to direct users to potentially harmful content. The ML classifier and ClamAV detection further support the malicious nature of this document, likely used as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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.
  • 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://crophysi.ru/strik?utm_term=how+to+calculate+ww+freestyle+points+allowance In PDF document text
    • https://ludalobupum.weebly.com/uploads/1/3/4/5/134528654/88466.pdfIn PDF document text
    • http://reduslimitalia-ufficiale.site/21677529691o0t5a.pdfIn PDF document text
    • https://pasadaxadug.weebly.com/uploads/1/3/5/3/135390708/feguvij.pdfIn PDF document text
    • https://ragojozuzaz.weebly.com/uploads/1/3/4/6/134668900/1e169.pdfIn PDF document text
    • http://allfreebets.ru/butterfingers_1._2_milligrams_albumq6yq9.pdfIn PDF document text
    • https://komamopiragi.weebly.com/uploads/1/3/4/4/134444029/xirugeriromo-genibob-nadomotodexuv.pdfIn PDF document text
    • http://scriptbook.xyz/11945088701qd0bl.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/i3igNje/vawaberewuk.pdfIn PDF document text
    • http://ideaita.fun/the_sims_freeplay_hack_androidb4032.pdfIn PDF document text
    • http://nubolutlion.xyz/rizovokirilexebanokumefobywhu.pdfIn PDF document text
    • https://cdn.sqhk.co/wirowanorax/4gigjjb/sovanalizopubarupoxe.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/jajuzasalikirut/qualifying_employment_application_form_example.pdfIn PDF document text
    • https://s3.amazonaws.com/lekezaru/mulozatolegovawitaw.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/achtung_spitfire_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/sojenozap/lindsay_adler_posing_guide.pdfIn PDF document text
    • http://gonatiw.rf.gd/duvazefiwuzapitupefujuvap.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/81110033705.pdfIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/american_heartworm_society_guidelines_dogs.pdfIn PDF document text
    • http://rupojizob.epizy.com/space_bubble_shooter_free_for_pc.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_off0000e0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A1 5164 bytes
SHA-256: 6c4c0e19bbd048dc414fdbec70ed1c80c2796c8bbbe33cbbb7a25b8185f81b4d
font_01_sfnt_off0000f25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25A 11128 bytes
SHA-256: 4f6fcaf3d8b40b8d418897844a9be73399bf340d340a485d84bc8df8fdb3c107

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