Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b51cc9ac0fadeea…

MALICIOUS

PDF

75.7 KB Created: 2021-02-26 09:37:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: b388a3bde98c493500dd771aabfaa05a SHA-1: 854798cba8ddf3938171573fd8980bef086ad45c SHA-256: 3b51cc9ac0fadeea5f42518883757f33d9b655aebde6ebb77f7f6dc9baeff720
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicates maliciousness. The document body, though heavily obfuscated, suggests a lure related to 'flightgear portugues', likely intended to trick users into visiting the linked sites for malicious purposes.

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
  • 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://jacksth.ru/wix?keyword=manual+flightgear+portugues PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417319/normal_60099b71c9ede.pdfIn PDF document text
    • http://puxuwowu.iblogger.org/zogirerojimopanefesuvux.pdfIn PDF document text
    • http://joy-todays.online/chennai_express_full_movie_300mb_mkv9xgtm.pdfIn PDF document text
    • https://nadusada.weebly.com/uploads/1/3/0/7/130740262/b0918b19b5133f.pdfIn PDF document text
    • https://fagutefoxod.weebly.com/uploads/1/3/4/2/134235025/rabonuxanajazisud.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417983/normal_5fc5af7c378f9.pdfIn PDF document text
    • https://jerefukixuludew.weebly.com/uploads/1/3/4/6/134686450/lakivafodej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375705/normal_6031dc466213e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367300/normal_6021868a08332.pdfIn PDF document text
    • http://trackengine.host/juruxiko20vai.pdfIn PDF document text
    • http://helplnstagramoffice.com/pevarebegodidit9p5b.pdfIn PDF document text
    • http://likelid.xyz/bitcoin_mining_server_apkhnvah.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nalakakowim.epizy.com/zelda_ocarina_of_time_sheet_music_violin.pdfIn PDF document text
    • http://kefedexopekose.rf.gd/hardness_setting_for_culligan_water_softener.pdfIn PDF document text
    • http://sakigekoxigukil.epizy.com/21322207363.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/fizepugulovakariwomalag.pdfIn PDF document text
    • http://dorediludopa.epizy.com/nowenabanozipubanimomedi.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_off0000ec9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9A 5168 bytes
SHA-256: 3fc39346bb1c0bd1d431ea1682beab139ff505a1ecb65695eb06d0f26f83baf9
font_01_sfnt_off0000fe3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3D 10276 bytes
SHA-256: 4212ce78e90bf6a0d4ec89a57ab7309d83c66e4f6f49112f487966e1fe6d2919

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