Malicious PDF — malware analysis report

Static analysis result for SHA-256 094122a73b7f19d9…

MALICIOUS

PDF

106.0 KB Created: 2021-04-30 21:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1fff3deca56b9453bf2181bc87304727 SHA-1: 1066a7f44cec2bbb60d834293b6fec4ead864eee SHA-256: 094122a73b7f19d9182bfd6a613f7eab253f8c00f336d1535730af1d8fce8b4e
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://zajinet.ru/strik?utm_term=polygons+and+quadrilaterals+worksheet+answer+key PDF link annotation
    • http://fapasevusiledap.mygamesonline.org/fevovipo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476783/normal_606be9268aa06.pdfIn PDF document text
    • http://leziwazedo.mypressonline.com/69423129588.pdfIn PDF document text
    • http://nickned.me/hp_laserjet_4050tn_specsguwl2.pdfIn PDF document text
    • https://cdn.sqhk.co/bibunifez/PAjigfc/41579583224.pdfIn PDF document text
    • https://cdn.sqhk.co/jufebarur/ahj3ibJ/okcupid_promo_code.pdfIn PDF document text
    • https://cdn.sqhk.co/lakabarobuk/OMjeGjf/485289820.pdfIn PDF document text
    • http://lishop.site/jitosaxawvoocr.pdfIn PDF document text
    • http://mirumumavetifun.mypressonline.com/tecnica_de_absorcion_atomica.pdfIn PDF document text
    • http://fishland.store/ariel_steam_shower_replacement_partsdpzhq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369498/normal_6025a61163091.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://raxajabidadida.onlinewebshop.net/alto_sax_songs.pdfIn PDF document text
    • http://rewuwuja.onlinewebshop.net/zemetitulux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd950084-b2c5-4d77-82e6-c73540d25a7c/34152877245.pdfIn PDF document text
    • http://netedokikisij.epizy.com/4806867655.pdfIn PDF document text
    • http://xabuduzefaf.epizy.com/69063751774.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18796a1f-7380-4b8f-bd38-ca2a40b4eca0/sodium_in_taco_bell_power_bowl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/758e667b-02ec-460b-84f0-b8d22033b907/65743974158.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_off00015e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E0B 5472 bytes
SHA-256: d0fd15ee948f7aebd26dd3ce3f5f532f752ef88450c0de6fd7a85d108048b0e1
font_01_sfnt_off000170b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170B3 12496 bytes
SHA-256: 5ec14c7e7e6096085ef2ad9ebac29527fb54193d5f8eab9e3694e061aa17e335

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