Malicious PDF — malware analysis report

Static analysis result for SHA-256 978353ef899dd58c…

MALICIOUS

PDF

72.6 KB Created: 2021-03-20 17:21:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a9048dfd763f86e3d5d1b17a91b1fb18 SHA-1: 200d3abdbe608d69552519ce17777aae72b8bd3a SHA-256: 978353ef899dd58c5bd7665416841a57e0bd33ab65029edeec83ff1034864931
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are SEO-optimized and redirect to potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' heuristics. The primary redirector URL, 'https://mezovuduw.ru/123?utm_term=blizzard+battle.+net+desktop+app', suggests a lure related to software installation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely a phishing or trojan delivery mechanism.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://mezovuduw.ru/123?utm_term=blizzard+battle.+net+desktop+app PDF link annotation
    • http://collegegraduatecentraldating.com/baidu_pc_faster_for_windows_10vsjbn.pdfIn PDF document text
    • https://bebabigi.weebly.com/uploads/1/3/5/9/135977904/3640794.pdfIn PDF document text
    • http://stankoff.org/86806961185ps4ui.pdfIn PDF document text
    • https://kenojulovananav.weebly.com/uploads/1/3/4/0/134016885/3595837.pdfIn PDF document text
    • http://ekzo-fruit.ru/is_the_pet_rock_in_adopt_me_permanent6iclu.pdfIn PDF document text
    • http://kinemulawaw.sportsontheweb.net/saxon_algebra_1_tests.pdfIn PDF document text
    • http://repair-foto.ru/what_to_do_in_the_first_90_days_as_a_new_manageriom78.pdfIn PDF document text
    • http://rivozuzeno.mywebcommunity.org/12081903154.pdfIn PDF document text
    • http://parovosi.mygamesonline.org/world_war_z_movie_free_download_in_tamil.pdfIn PDF document text
    • http://meinekarten.best/genesis_50_1-6_meaningxa5xg.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/fewifuwu/function_notation_word_problems_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/zoburasabuwiras.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/afrontamiento_emocional.pdfIn PDF document text
    • http://kipazafar.atwebpages.com/radefibuluvumajapuzo.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/11949167868.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/best_bongo_movies.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/how_to_convert_microsoft_excel_2007_to.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/skyrim_ps4_keeps_crashing.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/acknowledgement_template_dissertation.pdfIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/dining_table_design_guidelines.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD743 5288 bytes
SHA-256: 3b58641ce13a291c65b3d14f812254245b2ad5c0623405110b31b1a8cdbafb6a
font_01_sfnt_off0000e94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94F 18352 bytes
SHA-256: 7160443024e4f1b682fb69b613a85e13a35cee06f257af9d31ec95e4bd64a4c8

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