Malicious PDF — malware analysis report

Static analysis result for SHA-256 b28292580b9ead30…

MALICIOUS

PDF

108.0 KB Created: 2021-03-18 12:06:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9346a8aa8009433185c96728f6888d22 SHA-1: c34d56d61bda94a906d31887c9e71f673e0feb89 SHA-256: b28292580b9ead30d5169ccdf1dc6de0d553b45832f649b31a522b4895fe5668
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to link farms hosted on disposable domains, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

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://resalured.ru/strik?utm_term=perfume+the+story+of+a+murderer+book+synopsis PDF link annotation
    • http://wejaduz.mypressonline.com/dopifegu.pdfIn PDF document text
    • http://vebifitapex.mypressonline.com/20750295446.pdfIn PDF document text
    • https://jukosixosibi.weebly.com/uploads/1/3/1/8/131871462/3314850.pdfIn PDF document text
    • http://blacklaser.ru/once_more_to_the_lake_chill_of_death_meaning7b60s.pdfIn PDF document text
    • http://love-cosmetics.shop/free_dungeon_tilescldtz.pdfIn PDF document text
    • https://tamegafatukof.weebly.com/uploads/1/3/4/4/134400059/4c871629b3d.pdfIn PDF document text
    • http://kapovulup.mywebcommunity.org/what_are_the_cdl_endorsements.pdfIn PDF document text
    • http://natbeach.space/44050803508101vd.pdfIn PDF document text
    • https://renobikedasel.weebly.com/uploads/1/3/4/8/134897329/2734686.pdfIn PDF document text
    • http://mokemowowove.mygamesonline.org/tokyo_ghoul_anime_main_characters.pdfIn PDF document text
    • http://zatoxuvisovapuf.sportsontheweb.net/how_to_change_nc_license_plate.pdfIn PDF document text
    • https://jovigazever.weebly.com/uploads/1/3/1/6/131637362/4678fb030adcadb.pdfIn PDF document text
    • http://good-production18.site/ranirotorofeapx8e.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/kexamoxusinixu/asus_m4a89gtd_pro_usb3_specs.pdfIn PDF document text
    • http://gagugitebuf.atwebpages.com/festo_pneumatic_cylinder_catalog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb14068b-7699-4011-aaff-dc6754624e20/22387902103.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/vekumulisekipowaxebame.pdfIn PDF document text
    • http://jumepenitujox.atwebpages.com/70641871109.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b050ede4-89c7-4166-8c56-b2bfec443a38/ryobi_router_table_base_plate.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_off00016646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16646 5556 bytes
SHA-256: 2a2640b4f6bd21306d5248fee1dd103704483c9efb3f462d0210ebfe6b0bf155
font_01_sfnt_off00017901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17901 12704 bytes
SHA-256: 53c9bd382e7c048911c3d822728ab1016116fe02fa1d7b14ffd4df4bb76bfacc

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