Malicious PDF — malware analysis report

Static analysis result for SHA-256 1926826cb5a4c070…

MALICIOUS

PDF

79.6 KB Created: 2021-02-22 02:36:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 6e23b9a69065561bf464b88502131351 SHA-1: d0ff2f71f3139cf814ccb74161663d61b0c637c7 SHA-256: 1926826cb5a4c0700c2f8bc9b9daa2db3f3238c2c2ce03db0dcf2d6537c0eb2c
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. The document body, though heavily obfuscated, suggests a lure related to 'test answers'. The presence of external URIs and the overall structure point towards a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/wix?keyword=foolproof+module+1+test+answers PDF link annotation
    • https://fuzedefona.weebly.com/uploads/1/3/4/5/134578490/goliwe.pdfIn PDF document text
    • http://braco.ru/nilivax6y5yr.pdfIn PDF document text
    • https://pofimutazotoxo.weebly.com/uploads/1/3/4/0/134000188/71c5b0db73b9.pdfIn PDF document text
    • https://wuduzavuvavazi.weebly.com/uploads/1/3/4/6/134618101/kiram-sagogo.pdfIn PDF document text
    • http://kiwirixup.22web.org/unicorn_editable_birthday_invitations_templates_free.pdfIn PDF document text
    • https://cdn.sqhk.co/gilitejeku/idhekBn/super_bomberman_r_switch_game.pdfIn PDF document text
    • https://wawodupalise.weebly.com/uploads/1/3/4/6/134621762/6eb611c.pdfIn PDF document text
    • http://juilopkiretlo.ru/can_a_juice_cleanse_help_you_lose_weighted2xh.pdfIn PDF document text
    • https://cdn.sqhk.co/pozedezupase/0jehdjb/best_open_world_survival_craft.pdfIn PDF document text
    • http://idealslim-italiaoficial.site/80925434488e612a.pdfIn PDF document text
    • https://vesanawe.weebly.com/uploads/1/3/4/6/134602832/vezedaluwolubipewin.pdfIn PDF document text
    • http://legko.travel/mitulenlf6x5.pdfIn PDF document text
    • http://copyright-services-us.com/fuwilakojesalijodogutitzotq.pdfIn PDF document text
    • https://cdn.sqhk.co/pelebitebi/gfjapid/zivabitasararak.pdfIn PDF document text
    • https://cdn.sqhk.co/wojipezusax/qid4Rme/99594420852.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://zaximibirada.epizy.com/85809766028.pdfIn PDF document text
    • http://misibinebob.epizy.com/logo_quiz_world_answers_level_20.pdfIn PDF document text
    • http://temitugefowe.epizy.com/curriculum_vitae_template_word_online.pdfIn PDF document text
    • http://rajokawaxes.rf.gd/netflix_para_android_7._1._2_apk.pdfIn PDF document text
    • http://wijobofeforot.epizy.com/air_con_split_system_manual.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B1 5120 bytes
SHA-256: ec6d0084370bba3c5007d78b94d1c6959a205712a1713451c116071521a610a8
font_01_sfnt_off0000e915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE915 10676 bytes
SHA-256: 302ffd8f6fa265a640df5f941079e637d2efc68e855b9cec0c84a87f22b07f05
font_02_sfnt_off00010dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAE 16180 bytes
SHA-256: 8caa968e946bec887461fe4e6a0ecaa30738e2baf993c7c0a2b39022f0f5432f
font_03_sfnt_off000122cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CD 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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