Malicious PDF — malware analysis report

Static analysis result for SHA-256 abf87ba1a4ed9869…

MALICIOUS

PDF

85.8 KB Created: 2021-02-27 19:05:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 02dcfd309c77e7e187efd78f61e897e5 SHA-1: d1cf8a8a6bfb3978fcba5ae3e9fccf6e8e512cf4 SHA-256: abf87ba1a4ed9869a90716342357f57bfc689642ef67b490fa0974364c8ac557
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to technical documents, further supporting a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/wb?keyword=solucionario%20mecanica%20vectorial%20para%20ingenieros%20estatica%207%20edicion%20capitulo%202 PDF link annotation
    • https://cdn.sqhk.co/tivuzofep/YhDXygg/electronic_music_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/wireriduwude/YegiRWG/neon_chrome_ps4.pdfIn PDF document text
    • http://boxberry-24.cc/30158409718m6h6i.pdfIn PDF document text
    • http://lifeshop.pro/sujuranaruvapifuwisanapuculqq.pdfIn PDF document text
    • http://pigigozoruda.mypressonline.com/rt_ac68u_default_password.pdfIn PDF document text
    • http://inostrana.com/36437381866oxx32.pdfIn PDF document text
    • https://cdn.sqhk.co/nokotadi/BjbAjcy/synology_photo_samsung_smart_tv.pdfIn PDF document text
    • http://pedrons.space/88301746097k5ytc.pdfIn PDF document text
    • http://mebets.xyz/acetic_acid_5_safety_data_sheetrtbnt.pdfIn PDF document text
    • http://xubanapirobula.mypressonline.com/mr_coffee_4_cup_coffee_maker_manual.pdfIn PDF document text
    • http://lobabinuladeri.medianewsonline.com/english_idioms_list_with_meanings_and_examples.pdfIn PDF document text
    • https://cdn.sqhk.co/kitolitik/bGlGHib/missile_defense_game_unblocked.pdfIn PDF document text
    • http://lojasamericanasbr.com/what_to_do_with_an_international_law_degreefy7u6.pdfIn PDF document text
    • http://qiwi-wallet.online/449243389826xcfc.pdfIn PDF document text
    • http://instas.site/732375590102rdin.pdfIn PDF document text
    • http://xuxijosut.sportsontheweb.net/90885582631.pdfIn PDF document text
    • https://cdn.sqhk.co/dovawowo/geGxdOg/dunkin_donuts_charli_drink_calories.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/lurasugabikab.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_off0001042c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042C 5768 bytes
SHA-256: 73033c842227ab4bbfe065dfc3a19e11c20fd0b756db2d7deae885992ca52662
font_01_sfnt_off000117ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CA 15316 bytes
SHA-256: 50dc47529176d73d7ed4a4ae5eb36670f17f709dceb656c164f5a2992f53faca

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