Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4bee025f5046a03…

MALICIOUS

PDF

68.4 KB Created: 2021-01-21 11:41:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 77dd36c3cde09aea26a7c46586232cb9 SHA-1: 8e392478d21affdee2c8da58aa76c73a337f75d5 SHA-256: c4bee025f5046a039401949cf6e2052c83407ab8cbe7797cf1f06db632232847
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous embedded URLs, with at least one identified as a known malicious redirector. The file's structure and the presence of many links suggest it functions as a link farm or phishing lure, aiming to direct users to potentially harmful websites.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffine.ru/aws?utm_term=medical+instrumentation+lab+manual In PDF document text
    • https://site-1193936.mozfiles.com/files/1193936/diximisuxiferajovojewokok.pdfIn PDF document text
    • https://cdn.sqhk.co/zopimoforaja/jcVjh5A/my_home_design_story_episode_choices_download.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzonabudad/nhhJhcd/virivopuguwiziro.pdfIn PDF document text
    • https://pinababinazu.weebly.com/uploads/1/3/2/6/132695354/2f7ac2bc3357.pdfIn PDF document text
    • https://site-1171643.mozfiles.com/files/1171643/reading_your_pathology_report_breast_cancer.pdfIn PDF document text
    • https://wasatetokis.weebly.com/uploads/1/3/4/5/134513062/061a5376.pdfIn PDF document text
    • https://zaluvunikuf.weebly.com/uploads/1/3/1/0/131070459/1392dc.pdfIn PDF document text
    • https://delujopasetew.weebly.com/uploads/1/3/4/3/134399242/46968.pdfIn PDF document text
    • https://jenodaxadow.weebly.com/uploads/1/3/4/0/134012655/6150119.pdfIn PDF document text
    • https://cdn.sqhk.co/gajerivab/iahejeQ/horizon_7._0_at_treadmill_bluetooth_pin.pdfIn PDF document text
    • http://doworevo.22web.org/55272852616.pdfIn PDF document text
    • https://site-1171714.mozfiles.com/files/1171714/marketplace_facebook_app_not_working.pdfIn PDF document text
    • https://site-1178690.mozfiles.com/files/1178690/25817666977.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bobupugarini.epizy.com/90828691425.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/xiaomi_mi_9_se_update_android_10.pdfIn PDF document text
    • http://famebod.epizy.com/69921209194.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/backup_iphone_to_android_app.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/irish_contract_of_employment_template.pdfIn PDF document text
    • https://s3.amazonaws.com/makixibawumebol/nimelugojawabimiferixema.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_off0000cd32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD32 5232 bytes
SHA-256: 99c96f0e5567c2556255539081393be542fef6d85ce2f593f1895568cd5b3709
font_01_sfnt_off0000dee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE8 10900 bytes
SHA-256: 1bf03aa66805deb65d6904b791be0d864217290f3f3d268f5e57684bac9ce9e6

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