Malicious PDF — malware analysis report

Static analysis result for SHA-256 45fe09943aee2c8a…

MALICIOUS

PDF

102.2 KB Created: 2021-02-18 11:20:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: cda5723a294fc5be4cd8b8a3bc8bbad1 SHA-1: ed532fde53ce4b5a9544687cbb98106bd5507686 SHA-256: 45fe09943aee2c8aace31dffc96345ae106d587c51c6886130e9ce3faa27eb66
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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/strik?utm_term=samsung+un55ju6400fxza+stand PDF link annotation
    • https://puruvafapazono.weebly.com/uploads/1/3/0/8/130815059/3563471.pdfIn PDF document text
    • http://workshop-fb.ru/furidikowawlf5op.pdfIn PDF document text
    • http://goloturasituj.66ghz.com/24389639498.pdfIn PDF document text
    • https://sazekunoteti.weebly.com/uploads/1/3/2/7/132740187/fofezewewere_xuferozipaf_dejinopitajowa_zojube.pdfIn PDF document text
    • https://mirajaxudedina.weebly.com/uploads/1/3/0/7/130775596/9360117.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/dRMjghh/kusevizotapilatawanibef.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzufoxo/cp6geji/wreck_it_ralph_2_time_period.pdfIn PDF document text
    • http://livecopyrightverification.com/fnaf_1_apk_mod_unlimited_powerv34og.pdfIn PDF document text
    • http://rubeatyshop.xyz/baghban_hd_movie_720px6g59.pdfIn PDF document text
    • https://cdn.sqhk.co/tamaladafa/eVihP9U/talion_definition_pronunciation.pdfIn PDF document text
    • https://cdn.sqhk.co/komajekolino/giRihIx/free_music_bollywood_songs_download_320kbps.pdfIn PDF document text
    • http://maddot.space/certification_of_trust_formbn19s.pdfIn PDF document text
    • https://cdn.sqhk.co/forexidof/hjctO43/word_connect_game_free_download_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/posojuvapono/c4AFn9w/63955028650.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365620/normal_5fc97869018ae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sumidemeg.epizy.com/felusezakozi.pdfIn PDF document text
    • http://gixogofano.rf.gd/english_alphabet_fonts_free.pdfIn PDF document text
    • http://panekad.rf.gd/wrong_turn_movie_tamil_play.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_off00014fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FCA 5904 bytes
SHA-256: 1e0e6a2c814dea6d1665ece6663b0e5fd4e7aa2d580c8c8727cd5e6c67f5b53d
font_01_sfnt_off000163f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163F3 11548 bytes
SHA-256: 2f1449128f31deb4f3741b9de03127eb814cb7a0856b06601a0940a9488e51d1

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