Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f7a39db57cb73b…

MALICIOUS

PDF

70.3 KB Created: 2021-01-22 00:31:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 078297f4f728a6a4965f04b58ad67155 SHA-1: c28f0d918bdda34cf704071dcfa1dc651b7269a5 SHA-256: 16f7a39db57cb73bf0161dd92a065ecd454fb0e9c59fd3853ca77039a2540d12
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is structured as a link farm, suggesting an attempt to redirect users to malicious sites or downloads. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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.
  • 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://trafffi.ru/123?utm_term=aptoide+apk+download+for+apkpure PDF link annotation
    • https://site-1173706.mozfiles.com/files/1173706/teluvigorepiwov.pdfIn PDF document text
    • https://site-1174052.mozfiles.com/files/1174052/lipilip.pdfIn PDF document text
    • https://site-1178749.mozfiles.com/files/1178749/34055481518.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/ijOF6bU/music_video_maker_photo_slideshow.pdfIn PDF document text
    • https://site-1172012.mozfiles.com/files/1172012/nfl_fantasy_football_cheat_sheet_non_ppr.pdfIn PDF document text
    • https://site-1172855.mozfiles.com/files/1172855/xadaxowafugav.pdfIn PDF document text
    • http://tisimewifexumi.iblogger.org/jump_rope_for_heart_canada_pledge_sheet.pdfIn PDF document text
    • https://site-1175575.mozfiles.com/files/1175575/zafoxogumawibaxunewilug.pdfIn PDF document text
    • https://site-1253897.mozfiles.com/files/1253897/35780518369.pdfIn PDF document text
    • https://site-1167931.mozfiles.com/files/1167931/printable_math_worksheets_multiplying_fractions.pdfIn PDF document text
    • https://cdn.sqhk.co/nolagutotato/Tiiighc/jake_s_adventure_salvation_sweetheart_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://marilineme.epizy.com/bullet_raja_movie_720p_openload.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/35111515369.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/dice_roller_program.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FD 4884 bytes
SHA-256: c35a33e9a22755928d7b04f5b7d2ca698213e9d872cc481aac8d1727532d7738
font_01_sfnt_off0000dab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB0 10564 bytes
SHA-256: 3219b9c160e8080596bd29c944bb938f206fb969314dec12139e6e2d58778bad
font_02_sfnt_off0000fddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDC 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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