Malicious PDF — malware analysis report

Static analysis result for SHA-256 4319d42fbb7b8127…

MALICIOUS

PDF

79.9 KB Created: 2021-04-08 01:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 17e66d193bf1005b9397c2455cdbdbc4 SHA-1: 1c31b7687c5a11849fcdf24fd8b5101c9eec021e SHA-256: 4319d42fbb7b81274c7484dd2a506b384c61d8c96a107dfd7ff0e3b948981810
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 0.9998

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://leonvi.ru/strik?utm_term=how+to+cut+shower+door+bottom+seal PDF link annotation
    • http://fijazubelanulek.mywebcommunity.org/11264327849.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421336/normal_5fdbd46ae09ea.pdfIn PDF document text
    • http://werikipirojenob.scienceontheweb.net/honda_shadow_sabre_1100_wiring_diagram.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411489/normal_5fedce7c028a9.pdfIn PDF document text
    • http://jivusibofonefud.mygamesonline.org/what_does_the_judgement_card_mean_in_a_love_reading.pdfIn PDF document text
    • http://porizaritofo.mypressonline.com/lakshmi_stotram_in_telugu_download.pdfIn PDF document text
    • http://fuvisetitisenon.mypressonline.com/jijaperez.pdfIn PDF document text
    • http://zokiwedilar.mypressonline.com/4434057261.pdfIn PDF document text
    • http://setirexude.22web.org/laxuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487413/normal_602c6d275a9b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416919/normal_601aae365aaec.pdfIn PDF document text
    • http://nekidifuton.medianewsonline.com/lettre_alphabet_francais.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ranevumovadul.rf.gd/silufivaxenudelivi.pdfIn PDF document text
    • http://sojufuka.atwebpages.com/daily_news_paper_download.pdfIn PDF document text
    • http://jefiferinazubim.atwebpages.com/plano_red_cercanias_madrid.pdfIn PDF document text
    • http://revodez.myartsonline.com/37146611341.pdfIn PDF document text
    • http://nibelid.epizy.com/60748231245.pdfIn PDF document text
    • http://xigilozixorod.epizy.com/deadpool_music_song.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_off0000fb0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0F 5372 bytes
SHA-256: b995d21f002f863a3ae55bc3559b0dc78c57d9e67d2138dbf831684ba7813b87
font_01_sfnt_off00010d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2F 10992 bytes
SHA-256: 81cf8ecb84cbe07bb3f22d10806096d0a63884a1a4c94e7e5f285eeaaccdb5e7

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