Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f61a20323fb2822…

MALICIOUS

PDF

96.8 KB Created: 2021-06-05 21:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 7e62173e606a130036a48dc938b4c01b SHA-1: 6909436b39ff48ffca12965c96459d2970c275bc SHA-256: 6f61a20323fb2822e35295ee897b6338f36d53888723411017a0e84af0599f96
146 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a callback phishing lure, specifically mentioning a 'phone lure in billing, refund, subscription, fraud, or security context'. While no scripts were extracted, the presence of external URIs and the ML classifier's high confidence score suggest malicious intent. The document body, though heavily obfuscated, contains text related to a 'printable fridge temperature log sheet', which could be a pretext for a fake issue.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://nipisod.ru/123?utm_term=printable+fridge+temperature+log+sheet PDF link annotation
    • https://gulapizebulo.weebly.com/uploads/1/3/1/0/131070336/zeginufidez.pdfIn PDF document text
    • https://nitiduzumamojas.weebly.com/uploads/1/3/7/5/137506598/8060720.pdfIn PDF document text
    • https://nibapexi.weebly.com/uploads/1/3/0/9/130969889/setodogapobo.pdfIn PDF document text
    • https://zixavuxo.weebly.com/uploads/1/3/1/3/131398386/josuzikofurideb-zoworunawubaf-zasakidogumodam.pdfIn PDF document text
    • https://dixevivoruze.weebly.com/uploads/1/3/1/4/131437918/vodusomije.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vifogajo.pbworks.com/f/mainstays_mini_blinds_cordless.pdfIn PDF document text
    • http://negaboxa.pbworks.com/w/file/fetch/144465441/flat_cancellation_letter_format_from_builder.pdfIn PDF document text
    • http://bofamawetodo.pbworks.com/w/file/fetch/144434121/the_whipping_boy_book_online.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/f/pssa_training_quiz_answers.pdfIn PDF document text
    • http://joraxakegeg.pbworks.com/w/file/fetch/144576432/how_to_set_up_a_trust_wireless_keyboard.pdfIn PDF document text
    • http://wikoborumun.pbworks.com/f/que_beneficios_tiene_el_magnesio_para_la_salud.pdfIn PDF document text
    • http://subazim.pbworks.com/w/file/fetch/144547140/how_to_day_trade_for_a_living_andrew_aziz_free_download.pdfIn PDF document text
    • http://wojipag.pbworks.com/f/xobaputepanutok.pdfIn PDF document text
    • http://vedufid.pbworks.com/w/file/fetch/144569487/active_and_passive_voice_in_past_continuous_tense_exercises.pdfIn PDF document text
    • http://kiruguwota.pbworks.com/w/file/fetch/144607386/tejadumerogojusomozazes.pdfIn PDF document text
    • http://litorabi.pbworks.com/w/file/fetch/144485646/73208859193.pdfIn PDF document text
    • http://xiwitanul.pbworks.com/f/givomesulam.pdfIn PDF document text
    • http://luwivaj.pbworks.com/w/file/fetch/144516789/calligraphy_pen_practice_sheets_free.pdfIn PDF document text
    • http://jolowajuwijo.pbworks.com/w/file/fetch/144491421/dna_structure_and_replication_worksheet_answers_model_2.pdfIn PDF document text
    • http://pazimonofe.pbworks.com/w/file/fetch/144460152/tolotutanuzenozotuwebir.pdfIn PDF document text
    • http://litorabi.pbworks.com/w/file/fetch/144489054/dd_players_handbook.pdfIn PDF document text
    • http://niluputevi.pbworks.com/f/wiwuzuze.pdfIn PDF document text
    • http://bujolajoxek.pbworks.com/w/file/fetch/144529773/how_to_take_professional_pictures_with_iphone_11_pro_max.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000123d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D3 5596 bytes
SHA-256: 63ec078c8b2c3bb3afa5e5758b6e553c1bbeef1c273c755ea253c0947c5c2049
font_01_sfnt_off000136a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A7 12164 bytes
SHA-256: 84d8581d4ce1a9b82883e565b5224f29bc1329df05a73a53adaa2235f5aae392
font_02_sfnt_off0001604b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1604B 16140 bytes
SHA-256: 5bfda07072dd2e1b0df7f1680a75ba616774ec51e1a09c257f000ba239241e1c