Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b51e08ceca07b45…

MALICIOUS

PDF

89.7 KB Created: 2021-03-09 02:20:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 57b4721f7d1e5fb80412c35ec4dfdd49 SHA-1: 00d216325ff4a0a4306cc474a806deb17116bda5 SHA-256: 3b51e08ceca07b45a246fe2c2da6457152cc7f0f43eaaab9eb273e56b311c546
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to learning English, which is a common tactic for social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ponafet.ru/strik?utm_term=learn+how+to+read+english+for+adults+pdf PDF link annotation
    • https://cdn.sqhk.co/tamupoto/hf2Sjf8/american_football_players_names_a-_z.pdfIn PDF document text
    • http://fodagirikazed.iblogger.org/91131530945.pdfIn PDF document text
    • https://guxemufisi.weebly.com/uploads/1/3/2/7/132710659/vavukojopewedabu.pdfIn PDF document text
    • http://on-arenas.com/todupejurofolitevofagirx3x.pdfIn PDF document text
    • https://lipuxavevafip.weebly.com/uploads/1/3/1/3/131398459/mudunumu_toridesebivu.pdfIn PDF document text
    • http://fallofelin.online/46426811285tz5zc.pdfIn PDF document text
    • https://xuxomesepek.weebly.com/uploads/1/3/4/6/134681539/vixesadifobuxafi.pdfIn PDF document text
    • https://cdn.sqhk.co/gotakavapu/qCjjoHL/18423333118.pdfIn PDF document text
    • http://rakajipof.22web.org/42779744539.pdfIn PDF document text
    • http://esclick.pro/3_positive_psychology_exercises_pack_pdf7evlf.pdfIn PDF document text
    • http://vykupavto54.ru/daperunuwule8047x.pdfIn PDF document text
    • http://najezeb.22web.org/employment_reference_letter_format_for_canada_immigration.pdfIn PDF document text
    • https://berapozi.weebly.com/uploads/1/3/0/7/130776213/f33e8c5eb6a1b4.pdfIn PDF document text
    • https://fukagopesuzidad.weebly.com/uploads/1/3/1/3/131381553/2214421.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1064e1b-b743-4064-a6d5-8014153119aa/wuwobav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e819fba6-d84b-4934-80de-f71b5d8fa3d8/rogufekivowasefexixasob.pdfIn PDF document text
    • http://bozumux.epizy.com/92582449479.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/826bc84b-fffc-48d6-b21b-7cfd8ae84877/36692573933.pdfIn PDF document text
    • http://mamisiz.rf.gd/88853424005.pdfIn PDF document text
    • http://wusumuforibit.epizy.com/nagij.pdfIn PDF document text
    • http://rarisirifamawod.rf.gd/15656510069.pdfIn PDF document text
    • http://buvazow.epizy.com/58441229159.pdfIn PDF document text
    • http://vukotirigepiv.epizy.com/where_did_the_african_swine_flu_come_from.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/195e7990-62fc-4c4b-b6fe-4edec8712573/34420869785.pdfIn PDF document text
    • http://nufewaruxemo.epizy.com/kezivagabi.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_off00012023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12023 5336 bytes
SHA-256: cab6af594c2188787006cef7b1cdb36485edb86b542142c0f9b059055d8892de
font_01_sfnt_off00013263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13263 11224 bytes
SHA-256: f1437e3e47b0cfd8d0aa78253ba8d322cf6c3c64adbc6daada84f7c566352353

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