Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa86820d488f12c2…

MALICIOUS

PDF

75.8 KB Created: 2021-04-05 18:31:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 5b20ba3046f5d40ac8c08667162eae42 SHA-1: 18580cc2768d2fee131a2ee0b632c7c05924c0b5 SHA-256: aa86820d488f12c25b252f2e2eaea075f758f7717c1df822702e45f71e194db8
126 Risk Score

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://mezovuduw.ru/123?utm_term=anselmi+san+vincenzo+tech+sheet PDF link annotation
    • http://melowew.scienceontheweb.net/64300966865.pdfIn PDF document text
    • https://cdn.sqhk.co/noneniwetav/AbUiDgc/mytaxi_ph_inc_contact_number.pdfIn PDF document text
    • http://kunujunekedi.mygamesonline.org/85020578314.pdfIn PDF document text
    • http://vuvuga.xyz/finugixixpjtmt.pdfIn PDF document text
    • http://1xbets-reg.site/adobe_premiere_pro_2020_downloadhlwsg.pdfIn PDF document text
    • https://cdn.sqhk.co/lakagifoter/g2gcSJ4/weraxufumog.pdfIn PDF document text
    • http://detonic-hypertonie.website/foxit_reader_for_ubuntu_freebxxb8.pdfIn PDF document text
    • https://cdn.sqhk.co/rapedipular/fSjijcv/47452004379.pdfIn PDF document text
    • http://instacopyrighthelpteam.com/13804518981b2hqn.pdfIn PDF document text
    • http://spiritstudio.ru/hillsborough_county_school_calendar_2021tc9wf.pdfIn PDF document text
    • https://cdn.sqhk.co/bepemuno/eVKifhf/rush_hit_singles.pdfIn PDF document text
    • https://cdn.sqhk.co/nugunexinazo/jidhija/kuruxef.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/29dd9434-1ff1-44f2-a019-24e07a75b859/somewhere_over_the_rainbow_piano_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15bdb5b7-7cc8-4366-85aa-08d8dba0d9b6/why_are_you_not_supposed_to_wash_clothes_on_new_years_day.pdfIn PDF document text
    • http://murapimopavopa.myartsonline.com/calikusu_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd6496e6-6a6e-44cc-8d28-62a432965411/how_to_calculate_pythagoras.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fb7f1f1-7038-47ca-b2b9-74281d0ffdce/how_to_air_dry_lg_washing_machine.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_off0000ea3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3E 5044 bytes
SHA-256: d3624419de6ff8aa7c7421fd14887e857967f9bb6a96da63924b1a1897c879d9
font_01_sfnt_off0000fb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4C 11576 bytes
SHA-256: f47c16af302bb03519cad529283bbf0cdbe2e32b99d6d34e96726eca366e80ec