Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8605a83339dbbad…

MALICIOUS

PDF

67.6 KB Created: 2021-02-01 23:42:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 56d702b38005d93269d7f270bf567220 SHA-1: 552eb4dc0a157ce1409eaf19ebd11007a8f767c5 SHA-256: f8605a83339dbbad3389c7b36f4e9a6fcce6b350064693544359239ba522d08a
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/wb?keyword=radio%20pia%2092.%207%20fm%20en%20vivo PDF link annotation
    • http://foyou.store/889888979288ijy1.pdfIn PDF document text
    • https://cdn.sqhk.co/vefemenivu/k3wLhgV/ncaa_rowing_championships_2019_d3.pdfIn PDF document text
    • http://universityru.fun/netflix_series_dark_mattereykye.pdfIn PDF document text
    • https://jotulamopusojo.weebly.com/uploads/1/3/4/4/134465369/9100278.pdfIn PDF document text
    • https://cdn.sqhk.co/dumotometapo/hhefjjy/cyberpunk_2077_countdown.pdfIn PDF document text
    • http://ridunculus.com/77913151530hj4ue.pdfIn PDF document text
    • http://damvglaz0.xyz/nervous_system_exam_questionsv0vjy.pdfIn PDF document text
    • http://winsl.space/532655612151oe4x.pdfIn PDF document text
    • http://lalat.space/vudigam85wt6.pdfIn PDF document text
    • https://cdn.sqhk.co/kisibijobu/jhhjXjc/javupaparotubov.pdfIn PDF document text
    • http://rating-bookmaker.ru/nirogafotugofo7ktf.pdfIn PDF document text
    • http://cashbackk.site/283018762466qlwp.pdfIn PDF document text
    • http://zarabotok.space/clash_of_clans_christmas_treesx1i89.pdfIn PDF document text
    • http://studytogether.fun/62459997082a8nlm.pdfIn PDF document text
    • http://sberbank.link/frases_divertidas_para_el_telefono_descompuestoue58z.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A5 5348 bytes
SHA-256: 724864b6b3bbd02671dfa1c56d6411e62879b4c1cc919fe1148a21b19e0d9c13
font_01_sfnt_off0000d8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E5 12964 bytes
SHA-256: 0bf48a8045908d8cd964e84b44ca847937da02d0f323bec4560cc6f38a9462b6

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