Malicious PDF — malware analysis report

Static analysis result for SHA-256 c35c60de0f2c2d8b…

MALICIOUS

PDF

83.7 KB Created: 2021-01-27 18:04:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b10b7172d25c0f7202467ae9d0aced77 SHA-1: 9eb5575d35624769bf6ce2b57ffa911403026891 SHA-256: c35c60de0f2c2d8b1218bff9caf82e9c0e911e0687ee03220546c3386e70df45
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with a primary focus on `https://jottigo.ru/123?utm_term=ardrey+kell+high+school`. The heuristic `PDF_SEO_DISPOSABLE_LINK_FARM` indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

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://jottigo.ru/123?utm_term=ardrey+kell+high+school PDF link annotation
    • http://losqutoq.online/71409122255tevpa.pdfIn PDF document text
    • https://cdn.sqhk.co/razulati/jbifed1/fruit_cutter_shapes.pdfIn PDF document text
    • http://hugertely.xyz/66090285066hdwbz.pdfIn PDF document text
    • http://sendgrid-de.com/05_vw_touaregc0x6e.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojelawov/jificje/popug.pdfIn PDF document text
    • http://excschool.ru/bridges_in_mathematics_grade_4_home_connections_answer_keyavrfz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374710/normal_5fe3a9d2c8f47.pdfIn PDF document text
    • http://shishkin-seed.xyz/tafovilekedijaviwedevisa1cl.pdfIn PDF document text
    • http://barashik.space/guzutakoxuwogewoi4qm7.pdfIn PDF document text
    • https://cdn.sqhk.co/zupisopad/iqjfcgf/26946982841.pdfIn PDF document text
    • http://skout.tech/23893853503i6yzf.pdfIn PDF document text
    • https://cdn.sqhk.co/lasesekov/Mjhhcjb/snes9x_controller_lag.pdfIn PDF document text
    • http://boothattendant.com/washington_hockey_rostertvr40.pdfIn PDF document text
    • http://detonic-official.website/7870652209381cdr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/libeganot/bully_scholarship_edition_trainer_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/basic_html_template_for_website.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/dibesugepugar.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA9 4748 bytes
SHA-256: 401eb766e43be0f15cd77eb177087dd31bff1206c01978839e604d423a6a6950
font_01_sfnt_off00010dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD5 11076 bytes
SHA-256: 2cd80eff6691fd1faca95a0657051afee97be92c00bd81628ad02d5355df44b2
font_02_sfnt_off00013358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13358 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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