Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff460be8d8ac4b87…

MALICIOUS

PDF

71.4 KB Created: 2021-02-24 10:41:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 42e75fbfa9333e9a901f9dabe9c89881 SHA-1: 998caa8695fa653252f4781bdb13476c2834217b SHA-256: ff460be8d8ac4b87cd7e2ad395a4066ba55d68a6a5d0d3b59cd52f6797777197
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=harman+advance+pellet+stove+parts PDF link annotation
    • https://pakilimog.weebly.com/uploads/1/3/4/3/134363837/56c5cd4c829b29.pdfIn PDF document text
    • https://cdn.sqhk.co/jarixizotib/jxvjdie/infection_control_guidelines_for_nursing_homes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451348/normal_5feb69e7827a4.pdfIn PDF document text
    • https://cdn.sqhk.co/tutogalubete/YTTKhIS/invaluable_synonym_noun.pdfIn PDF document text
    • http://atomyimperial.ru/felime2gimb.pdfIn PDF document text
    • http://romeita.space/lg_led_tv_main_board_problemshpc1d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369920/normal_600942f345443.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379616/normal_5fdc42c9a49d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376354/normal_60066d69c2103.pdfIn PDF document text
    • https://pejupatuwotim.weebly.com/uploads/1/3/2/8/132814375/4435111.pdfIn PDF document text
    • http://rixugogalide.22web.org/donibabefituve.pdfIn PDF document text
    • https://piturerakilapes.weebly.com/uploads/1/3/0/7/130775197/2196770.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367914/normal_5fe4b647bd5da.pdfIn PDF document text
    • https://cdn.sqhk.co/mitajaso/oqjcibH/legends_football_league_2019_juego.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wirodugapilab.epizy.com/canon_speedlite_600ex-rt_ii.pdfIn PDF document text
    • https://s3.amazonaws.com/ditiruz/descargar_aplicaciones_android_pc.pdfIn PDF document text
    • http://pugupokevimukov.epizy.com/ab_workouts.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/67439773273.pdfIn PDF document text
    • https://s3.amazonaws.com/dusubonifu/mawidesunepejirosazof.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/nabowojojupidu.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_off0000d9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DE 5240 bytes
SHA-256: 2ce5b1192372172c13d8fe37c3f67cb1a0979e4f2530e93c72c2a49831870578
font_01_sfnt_off0000eb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9C 10672 bytes
SHA-256: dc8f12f9777364a79c6e0995a536eb39040848b2ecc71261ee6ad0a0999e5a5d

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