Malicious PDF — malware analysis report

Static analysis result for SHA-256 224cf3b8ac1195e5…

MALICIOUS

PDF

83.1 KB Created: 2020-12-15 04:26:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 34c4cd92ea5dd175207a2a40cbc3d6e7 SHA-1: 9a741aa720c8b5f322efae1bc2972bcfd170db3b SHA-256: 224cf3b8ac1195e5561eedc84c3ccd5f9cb3d6f1fbb46dc7c7f209f761d44eae
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure related to a service manual, aligning with common phishing tactics.

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
  • 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://cctraff.ru/123?utm_term=dometic+dm2652+refrigerator+service+manual In PDF document text
    • https://getomipo.weebly.com/uploads/1/3/4/4/134403721/b90a0cb4b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc4cc8717e72026400310be/t/5fcee1ff7c36362741a0890f/1607393791686/ruzewadomoditotipevazaf.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5072ec14dfd36fe0c117c/t/5fcd472aeb18547f4b926d02/1607288619228/japotifupedufe.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc12bef2cf09257bd6dc3ad/t/5fc64bdf6457125654127660/1606831072395/mx_player_no_sound_android_box.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/321f662f-1231-4531-a8fd-a90a4f1ffc0e/84231918714.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce4f7dcc0d2519aaa121b5/t/5fd64454481cfa31adc33d5e/1607877716765/modern_periodic_table_free.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc30157c6d96458362fd63e/t/5fc4dac27acac6192a598ed1/1606736578617/24754390297.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd01de72f8b574a0f41128/1606222315488/root_booster_pro_apk_rexdl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3795d05a-8761-45da-bf3a-529323057186/buxonusotovi.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6b9d1c43b171198859c62/t/5fc8fa2affd254225cc1c7c3/1607006762962/followers_analyzer_for_twitter.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc565e860f2895dc105f20e/t/5fd707b73ebe04163176a1bf/1607927735872/afcat_1_2018_question_paper_with_answers.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc597a0f9866f3fd2f3d113/t/5fcd45b56f0099009e71740e/1607288246460/civil_war_battlefields_around_atlanta.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_off000105af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AF 5808 bytes
SHA-256: 59caf011bec5747fd81c922a1729dbdc50d9ebda4917001b519438f5075f7eff
font_01_sfnt_off00011970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11970 11260 bytes
SHA-256: 4e8032f31828a1b33a3d978b014ca1b2796c08fc233e36fdc1246d700147941c

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