Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d1d78b4fafb1330…

MALICIOUS

PDF

78.5 KB Created: 2021-04-04 00:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 10d57a6cd86ec627044f8493cc4321d8 SHA-1: c3e3b2194a4493e5f34dd6a8e2e8adff8b177b25 SHA-256: 4d1d78b4fafb133005e9a5e0f30ee86635d3e33532050c9d78ab81611db5fb30
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, indicating it likely contains malicious content. It functions as a link farm, embedding numerous external URLs that point to other PDF files hosted on disposable domains. The primary purpose appears to be SEO manipulation or the distribution of further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/strik?utm_term=kawasaki+engine+parts+australia PDF link annotation
    • https://guwiretaxuzaji.weebly.com/uploads/1/3/4/6/134687660/togixorisowe.pdfIn PDF document text
    • https://wegebumerovoni.weebly.com/uploads/1/3/5/3/135387929/zekidix.pdfIn PDF document text
    • https://vidimepimexuja.weebly.com/uploads/1/3/4/6/134626803/90e1c2.pdfIn PDF document text
    • https://letazofuwukuge.weebly.com/uploads/1/3/4/8/134869061/9317188.pdfIn PDF document text
    • https://zokukomusisitu.weebly.com/uploads/1/3/5/3/135323242/9669948.pdfIn PDF document text
    • https://rabupipimefife.weebly.com/uploads/1/3/0/8/130874594/bezegorogawupu_kiberofe.pdfIn PDF document text
    • https://bobefadapuxat.weebly.com/uploads/1/3/4/8/134858353/9314372.pdfIn PDF document text
    • https://bobelijanufav.weebly.com/uploads/1/3/5/9/135960041/pevinimitawij-jitepexuwo-mivovima.pdfIn PDF document text
    • https://cdn.sqhk.co/dudumadopole/Zxihkha/fizifop.pdfIn PDF document text
    • https://jodawozuwiki.weebly.com/uploads/1/3/1/4/131437728/dojepiv.pdfIn PDF document text
    • https://memudodonimik.weebly.com/uploads/1/3/1/4/131406547/zosazapeleb.pdfIn PDF document text
    • https://xapitutas.weebly.com/uploads/1/3/0/8/130813648/sujafowinura-pelelopepilone.pdfIn PDF document text
    • https://lidafeli.weebly.com/uploads/1/3/4/6/134683499/6216260.pdfIn PDF document text
    • https://sajoviginuxux.weebly.com/uploads/1/3/2/7/132712139/7323141.pdfIn PDF document text
    • https://cdn.sqhk.co/nexoratuxi/egjigbb/piano_keyboard_notes_for_telugu_songs.pdfIn PDF document text
    • https://tujilebofali.weebly.com/uploads/1/3/5/3/135398949/37fd0c52.pdfIn PDF document text
    • https://sezibuginodeso.weebly.com/uploads/1/3/4/4/134470526/gatamu-tumerodupaga-zafujewosib.pdfIn PDF document text
    • https://parafobosa.weebly.com/uploads/1/3/1/8/131857791/51138c64a41a604.pdfIn PDF document text
    • https://wenakewijota.weebly.com/uploads/1/3/4/6/134611788/nigiwa.pdfIn PDF document text
    • https://fedifugakebijir.weebly.com/uploads/1/3/2/6/132695471/db2ebcb7a9469df.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xukonepuwe.rf.gd/37726123076.pdfIn PDF document text
    • http://likefiradoweze.rf.gd/teganokesanokokisuveliri.pdfIn PDF document text
    • http://balupamujoti.rf.gd/65302966942.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_off0000f61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61C 5112 bytes
SHA-256: e75bcd7166dd40a1148c760fd8c139d1cce2e48c3bc1e568e283d81a8e18d817
font_01_sfnt_off000107ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AB 10784 bytes
SHA-256: b402f3e07c8bfa04464780777763ed5f77fd3b53a7299292c5e36a6318543fee