Malicious PDF — malware analysis report

Static analysis result for SHA-256 74fbdf0163cae38a…

MALICIOUS

PDF

77.2 KB Created: 2021-03-31 11:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98d4786e51da1daca8caece5ef4e4f58 SHA-1: 29e358c711e3aba52df5c6baaeabb977bd19bb5a SHA-256: 74fbdf0163cae38a8c0cb5ad89ee650c0f28fc99686eb5d6016b76f5224b1998
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the document's structure suggest it's designed to redirect users to external sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=what+are+the+big+5+personality+traits
    • http://gitikirazidapi.medianewsonline.com/business_vocabulary_in_use_advanced_answer_key.pdf
    • https://cdn.sqhk.co/mamidusidozu/OjjoNUv/fusexokirurununuliva.pdf
    • https://cdn.sqhk.co/fupokonabat/6ibiegc/walls_ice_cream_triple_chocolate.pdf
    • http://xapepinozex.22web.org/26102294754.pdf
    • https://cdn.sqhk.co/jenotonolo/hh9he6h/identity_v_japanese_twitter.pdf
    • https://cdn.sqhk.co/gixobujikelu/Ixhige4/lipoxifibotipak.pdf
    • https://cdn.sqhk.co/mevutaxisut/jgcc1PU/eye_ear_nose_throat_doctor_las_vegas.pdf
    • https://cdn.sqhk.co/womilepeba/GNihhj6/kinij.pdf
    • https://cdn.sqhk.co/filovosa/Fshdjdl/zedge_app_download_play_store.pdf
    • https://cdn.sqhk.co/dodirijobadi/nzhbKhg/rupokaxovoturik.pdf
    • http://kifikawi.66ghz.com/68625315259.pdf
    • https://cdn.sqhk.co/jokufemij/r72heNX/angular_2_formdata_file.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://aed022ca-8a9d-452d-9022-56a74a585a14.filesusr.com/ugd/4d548e_c3c40114258042dabff99cb1c14cd303.pdf?index=true
    • https://f867c6cd-7aae-4938-a634-6821dcb48262.filesusr.com/ugd/eb45fa_697ea9f53f014018abe609f9af42fec1.pdf?index=true
    • https://a513df27-8ea1-49e5-9b48-af726a3c99b5.filesusr.com/ugd/c567c1_2eb5ae64b4f24d22a414e8e1197c1996.pdf?index=true
    • https://7a9095e9-4ba3-4ff7-9406-a75d0382ce8a.filesusr.com/ugd/db93e9_000851a8d91140bd95dd14f1351de6d6.pdf?index=true
    • https://a5a8f6e1-24ae-425c-880d-6f4079e3c376.filesusr.com/ugd/035627_06df77435ec146eb8c746f10222282f0.pdf?index=true
    • http://xixujoteb.epizy.com/6708248566.pdf
    • http://kisuneronebel.rf.gd/26022565244.pdf
    • http://jobupozedud.epizy.com/charity_commission_registration_form.pdf
    • http://dewudirana.epizy.com/chitika_meda_chitika_vesara_song_free.pdf
    • http://pigutun.myartsonline.com/sisevek.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_off0000ee1d.bin
954048866e748467a2e1764f02eee48336b4ef2f2e4968452f06f10f0150e20d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1D 5460 bytes
font_01_sfnt_off000100bc.bin
e2a74decbf816e41eff9c053f2476027226941a9c7598eae57eaa010d6fb7e3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100BC 10960 bytes

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