Malicious PDF — malware analysis report

Static analysis result for SHA-256 158e570f87be2edd…

MALICIOUS

PDF

178.3 KB Created: 2021-03-21 21:22:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 3432c5561a635d1faa2e9f3ed4687435 SHA-1: d0320b4158ac56d59d65edd1006db6efd35ee348 SHA-256: 158e570f87be2edd89a0b236c61074237d77432e2241f390afc346785c9514aa
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with `https://jacksth.ru/wix?keyword=ancient+china+early+civilizations` being a prominent example. The heuristic `PDF_SEO_DISPOSABLE_LINK_FARM` indicates the PDF is designed as a link farm on disposable hosting, reinforcing the phishing or malware distribution intent. No scripts were extracted, but the overall structure and URL usage suggest a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/wix?keyword=ancient+china+early+civilizations PDF link annotation
    • https://cdn.sqhk.co/rikopekela/ijhibC5/antihero_skateboards_team.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406775/normal_601055c8059eb.pdfIn PDF document text
    • http://futup.ru/marijelemiborarkxn9w.pdfIn PDF document text
    • http://afracheat8.xyz/nowhere_wed_rather_be_festivalcunk2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484610/normal_5ff0dc876552d.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/gcbbziY/microwave_hard_boiled_egg_maker_instructions.pdfIn PDF document text
    • http://toolsbestpricemicrometer.site/linea_del_tiempo_historia_de_mexico_epoca_prehispanica4ict7.pdfIn PDF document text
    • https://cdn.sqhk.co/tolademapati/TShcBhb/swiss_flights_from_london_city_airport_to_geneva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472764/normal_60501684a3ed7.pdfIn PDF document text
    • https://cdn.sqhk.co/kupuruvew/bW3nUgq/wutipaxorenidul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/15950653594.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3aba8118-2576-47cc-bb9f-7e4fd3888cf2/59046162419.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/cftc_cot_report_forex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d54e3b8d-82d0-4abc-8425-5ceb285184d4/the_other_side_of_the_mountain_movie_trailer.pdfIn PDF document text
    • http://fimibevo.epizy.com/jatefozunikufo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bd5500d-9d77-4f07-8870-1eded048e8f7/what_can_i_make_for_vegan_thanksgiving.pdfIn PDF document text
    • http://lelobuz.rf.gd/sharon_rogers_dark_star_uniform.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002256f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2256F 30200 bytes
SHA-256: a606c519d6562da73f964189f09f7ef31dac06a2f1afb60e2f753e51c45b0904
font_01_sfnt_off00028203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28203 5088 bytes
SHA-256: 58ae174b67743b518a7073652adbfa4fb7f4516c17b6d5b3a06978b3e0bd1814
font_02_sfnt_off00029361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29361 12332 bytes
SHA-256: 6e5efd8ee7701fb5d457bfc4ef704a8bdc0939dabae985c165d547734f6f0d75

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