Malicious PDF — malware analysis report

Static analysis result for SHA-256 955fc7369aae62ee…

MALICIOUS

PDF

72.7 KB Created: 2021-04-04 07:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b28c554ed3ecaba71d039f6a097e6df SHA-1: b4a780d50c65eb5cc424ae9af62e6794636f2dd5 SHA-256: 955fc7369aae62ee215b51fa149d0892de92667cfdf64dcbfc83bf1620907abc
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant portion pointing to disposable domains and exhibiting characteristics of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious content hosted on domains like dugedepap.ru.

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://dugedepap.ru/strik?utm_term=how+to+work+zoomer+chimp
    • http://tabikola.online/decision_tree_examples_in_r9kuda.pdf
    • http://copyright-supporthelp.com/korn_ferry_numerical_test_answersese7w.pdf
    • http://vowitufafuzebil.scienceontheweb.net/adding_3_fractions_with_unlike_denominators_worksheets.pdf
    • http://tur8osale.site/5830140157id49u.pdf
    • http://artyom.guru/what_does_pop_culture_mean_in_language_arts4d1h6.pdf
    • http://7lessons.fun/has_voyager_2_left_the_solar_systemc1agu.pdf
    • http://hookup755.fun/86949190592pqh7x.pdf
    • http://just-gopro.com/why_the_sky_turns_red24p2h.pdf
    • http://rovapiseve.22web.org/monsanto_acetic_acid_process.pdf
    • http://genusadnlo.space/the_screwtape_letters_study_guide_answerst1q00.pdf
    • http://buloshnaya.site/nopajunatojarofepinakabog9pz8x.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wubonaxe.epizy.com/texufakug.pdf
    • http://fijonomun.rf.gd/zulu_bible.pdf
    • http://mijovutotukedes.onlinewebshop.net/comunicazione_di_cessione_di_fabbricato.pdf
    • http://vejesigivilowen.rf.gd/99701004854.pdf
    • http://dijaxiletofevep.epizy.com/20875642203.pdf
    • http://kawalagijefoj.rf.gd/test_de_los_5_lenguajes_del_amor_para_solteros.pdf
    • http://buxebawimiro.epizy.com/chicken_noodle_soup_mp4.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000def7.bin
bd221a37ba3c4223df0705cac6ba3b403cd911d7436d35b1fb6a89fcb881f177		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF7 4920 bytes
font_01_sfnt_off0000efa4.bin
584bcc0aa79b992a714de052fa1a9b5a53546542b17da499e4abee8eb499609d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA4 10744 bytes

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