Malicious PDF — malware analysis report

Static analysis result for SHA-256 604edb3469030519…

MALICIOUS

PDF

60.2 KB Created: 2020-11-17 19:42:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5cca0b4bb1cb15b23c5413c7fb1ca64f SHA-1: da9bcc5783426b2b69ef0193349be2175433a247 SHA-256: 604edb34690305199a228df343c6d02e2c0c1741f31781b0fc5aa1970a8995ca
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 0.9996

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://trafffe.ru/strik?utm_term=geometria+y+trigonometria+pdf+baldor PDF link annotation
    • https://zafozudakajadev.weebly.com/uploads/1/3/0/8/130814863/1040240.pdfIn PDF document text
    • https://lodavoxi.weebly.com/uploads/1/3/4/5/134505118/8ce59595ef.pdfIn PDF document text
    • https://disomigezet.weebly.com/uploads/1/3/4/2/134234605/6983802.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372382/normal_5f88cfd572f90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446651/normal_5fb33affc261c.pdfIn PDF document text
    • https://lajojadarexod.weebly.com/uploads/1/3/4/5/134506383/rapotapubujeto-pupujagelomuw.pdfIn PDF document text
    • https://lonunibulitog.weebly.com/uploads/1/3/4/4/134498578/jonibivula.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c57786fa-177e-48bb-8e52-8809696b9d17/nuestro_nuevo_testamento_merrill_c._tenney.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/juginevarej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b7232b7-8cc5-4d1a-95b3-42dcde6045c0/69698846400.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/auto_click_for_android_6._0.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56c42a88-e8df-4f76-801e-fcba438f812e/migevetetenexux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c428770c-ab0a-4b2f-8e1b-8d63591e33f5/vukutipi.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_off0000adaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADAA 5456 bytes
SHA-256: e2d0295333a67b44412cea505243c869ab61231c59bd702ed6d1864e9c0429db
font_01_sfnt_off0000c02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC02B 10132 bytes
SHA-256: f07bc8c6b6562b7880c593236692bcf2abbd9d617dbf85b16887980e4c18850d

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