Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dab8870b75bb048…

MALICIOUS

PDF

78.4 KB Created: 2021-02-15 05:32:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: e07ef0b6bf321ce565cf02c7de8248e9 SHA-1: 6af7aaa351b953880b326b444b844b270061ab96 SHA-256: 6dab8870b75bb04898081967880e4e8e30090b3a08592edcdb7514f641d7e122
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing infrastructure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a pattern of using many distinct hosts for links, a common tactic for evading detection or distributing malicious content. While no scripts were explicitly extracted, the presence of embedded URIs and the nature of the heuristics strongly suggest the PDF is designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jacksth.ru/wix?keyword=melvern+lake+campgrounds PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366312/normal_600478d5eb65a.pdfIn PDF document text
    • http://dupomixu.iblogger.org/cladogram_practice_answers.pdfIn PDF document text
    • http://sqrab.top/73758250611qfpn8.pdfIn PDF document text
    • http://dithetsen.xyz/offer_of_employment_letter_template_free_uk7bvre.pdfIn PDF document text
    • https://cdn.sqhk.co/kinemefuwa/0gcFkPZ/civil_war_battles_petersburg.pdfIn PDF document text
    • http://vukabuv.22web.org/pocket_door_roller_guides.pdfIn PDF document text
    • https://cdn.sqhk.co/gonolesuzam/dp9hbIR/30016946228.pdfIn PDF document text
    • http://copytoshka.ru/sat_geometry_questions_and_answersseyjf.pdfIn PDF document text
    • http://pimipaxu.22web.org/73221827697.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413347/normal_601887160cc2f.pdfIn PDF document text
    • http://businesslinecenter.com/ayurvedic_acupressure_book_free_downloadniddh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390661/normal_60048b2e3f995.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401546/normal_5fec582ab3b4a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380707/normal_5fc69ffe70fcd.pdfIn PDF document text
    • https://cdn.sqhk.co/tifapoxur/9gghah0/sputnik_movie_rating.pdfIn PDF document text
    • http://alteramaks.world/infusion_pump_marketk98tt.pdfIn PDF document text
    • https://cdn.sqhk.co/noviraxat/XQjjKhe/u_box_tv_amazon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417813/normal_5ffa5786f119f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490264/normal_600d434f2b815.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jipobemimojogot.rf.gd/amarnath_darshan_video.pdfIn PDF document text
    • http://wekidezeze.epizy.com/chupke_se_koi_aayega_status.pdfIn PDF document text
    • http://wawuzir.epizy.com/69735178560.pdfIn PDF document text
    • http://palalujopaxuv.epizy.com/zoferawuroxobunetega.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_off0000f4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C5 5520 bytes
SHA-256: 20fd3bd58f3b748909292aa20fb5f4408b8e3b3d6f722376dc4af2965f2f1901
font_01_sfnt_off0001078b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078B 10892 bytes
SHA-256: 25f608501a8b158d3af6da84de2af4424ce31727276b1cbc8c936debe18e09c5

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