Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8db8ff89707ead2…

MALICIOUS

PDF

73.5 KB Created: 2021-03-08 02:41:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bf9226595592cbf218713adc6c28232f SHA-1: 5b49ac0418678c8281735f6636feb476e328c161 SHA-256: e8db8ff89707ead2efeca5a439630be7268941a50d6886bb2eb14ade3ea8bcac
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/strik?utm_term=cuantas+tazas+de+harina+son+700+gramos PDF link annotation
    • http://50offshop.pro/revolution_the_off_road_experience_llcwtxla.pdfIn PDF document text
    • http://immorta-cross1.club/schumacher_750_watt_power_inverter_manual5msje.pdfIn PDF document text
    • http://rimka.xyz/cloud_atlas_espaol_latino_completa5etsv.pdfIn PDF document text
    • https://cdn.sqhk.co/femokuxajuz/chijaji/play_the_eagles_greatest_hits_songs.pdfIn PDF document text
    • http://usechambre.xyz/nawasijabusesajac7mvc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420906/normal_600df6f66196d.pdfIn PDF document text
    • http://heymama.store/2326906606484rsu.pdfIn PDF document text
    • http://azorocheat5.xyz/zodamalemidezurizarvup33.pdfIn PDF document text
    • https://cdn.sqhk.co/lewiwifo/jbVjb9b/9703641531.pdfIn PDF document text
    • http://pshcomonhere.xyz/688221384791w20j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413983/normal_601e759955d54.pdfIn PDF document text
    • https://cdn.sqhk.co/zarifabidit/tMv4jbi/pokemon_go_promo_codes_september_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481403/normal_5fcb290bad5b1.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/zuniverijesud/bash_synonym_formal.pdfIn PDF document text
    • http://xovajiw.rf.gd/1032054350.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/99599268755.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/xojawagotodexo.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/granbury_texas_weather_report.pdfIn PDF document text
    • http://raburuterurova.rf.gd/37522861327.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/39956027940.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_off0000df88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF88 5384 bytes
SHA-256: dc1098e68ee8da81b4fd7541d274dbb7f771913ff73963db3aa626644bdab8af
font_01_sfnt_off0000f1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B2 11920 bytes
SHA-256: cea2868e6b35c087e60a6ee72691447e5c55f1c1b144718d0c88fa70876449c4

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