Malicious PDF — malware analysis report

Static analysis result for SHA-256 041bbf0f5b6eef7a…

MALICIOUS

PDF

111.1 KB Created: 2021-03-28 15:38:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e849fdeff0c3f46219de72bdf1e1930c SHA-1: 7f2740be8fe77344c13d54e973111df80af75d9e SHA-256: 041bbf0f5b6eef7a349aa381fa3e873cff7281b16c35b33f331155d45d7efdae
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many of which are likely part of a link farm designed to obscure malicious intent. The document body, though heavily obfuscated, suggests a lure related to service manuals, which is consistent with the 'PDF_SEO_LINK_FARM' heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://xajibur.ru/wix?keyword=jenn+air+service+manual
    • https://cdn.sqhk.co/mikoduper/jejiehf/full_form_of_miid.pdf
    • https://cdn.sqhk.co/kovixileta/oAmK93C/what_is_minority_interest_in_balance_sheet.pdf
    • https://cdn.sqhk.co/fumamimed/jj9jaoi/4_pics_1_word_game_answers_all_levels.pdf
    • https://rolowuwojudazap.weebly.com/uploads/1/3/5/3/135302881/1684808.pdf
    • https://cdn.sqhk.co/vexorikodo/5haPCih/firuwuzakuvavibimupo.pdf
    • https://cdn.sqhk.co/lisupixiwe/jhgiihb/29253612138.pdf
    • https://serudifatu.weebly.com/uploads/1/3/5/3/135324897/3182098.pdf
    • https://cdn.sqhk.co/tuseliwi/hjAhcwJ/casino_slot_games_for_pc_free_download.pdf
    • https://cdn.sqhk.co/tinolaseja/MhghhfQ/octopus_garden_millville_nj.pdf
    • https://binaxigaxixin.weebly.com/uploads/1/3/4/8/134864800/4060273.pdf
    • https://cdn.sqhk.co/palevisi/dB4aggg/sojolijojoxikilux.pdf
    • https://xaxibilezulaf.weebly.com/uploads/1/3/4/0/134096047/borovojisopeji-vuxexowe.pdf
    • https://rejurikin.weebly.com/uploads/1/3/1/0/131070637/vobipifatek.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jevopemosod/honeywell_beutler_800_thermostat_manual.pdf
    • https://s3.amazonaws.com/dazuxujepov/8848565831.pdf
    • https://s3.amazonaws.com/zufojadibi/convert_cdr_to_jpg_format_online.pdf
    • https://s3.amazonaws.com/pavujiniz/zawoxojiguleremawe.pdf
    • https://s3.amazonaws.com/fulosobezur/9272662490.pdf
    • https://s3.amazonaws.com/nafamaragisek/39300866464.pdf
    • https://s3.amazonaws.com/faxaxos/office_of_child_care_medication_administration_form.pdf
    • https://s3.amazonaws.com/palevijuj/b._a._paris_za_zamknitymi_drzwiami.pdf
    • https://s3.amazonaws.com/pidufozu/67716176389.pdf
    • https://s3.amazonaws.com/vufupu/galaxia_esta_formada.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000173b3.bin
ebbd898bb8d93cd2b01b9f8069bdafeb2c42377264a2c4d2c0e4e0113d82d5ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x173B3 4992 bytes
font_01_sfnt_off0001849f.bin
b1f4ec36eccc8e23f1a7c77bee31d4c028d2758949f49f9fba76357c4143672f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1849F 12012 bytes

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