Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d24f915f81402e…

MALICIOUS

PDF

83.4 KB Created: 2021-03-28 00:58:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f818f625c3981174b5db5590a63f837a SHA-1: e7374bf98f9779c258fb2d55556d628a40c72914 SHA-256: b7d24f915f81402e7a5abfb2e9d23e3d2d8acc6344ab851daa51d7402031cb55
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. One of the primary external URIs points to 'dafemum.ru', which is suspicious. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links indicate a malicious intent to redirect users, potentially to phishing sites or to download further malware. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 4

  • 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.
  • 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://dafemum.ru/strik?utm_term=epson+xp-200+ink+walmart
    • https://cdn.sqhk.co/vufisolepu/jgkifeb/nagugofikowotokakut.pdf
    • https://cdn.sqhk.co/limizolaxa/NjdAjhc/xawererer.pdf
    • http://rakivabe.sportsontheweb.net/etre_avoir_fle.pdf
    • https://cdn.sqhk.co/gitaligido/KJjamge/91181685696.pdf
    • http://gusevoxuzuwelap.mywebcommunity.org/ganatilokotibopokunefiv.pdf
    • http://pojebanidik.mywebcommunity.org/armiger_warglaives_rules.pdf
    • http://bumasujofoj.getenjoyment.net/77893037613.pdf
    • https://cdn.sqhk.co/sojuzafu/jhekiaH/nhl_21_beta_end.pdf
    • https://cdn.sqhk.co/vavewiminiv/bdxNibT/6410578276.pdf
    • http://manovina.mypressonline.com/which_braun_ear_thermometer_is_best.pdf
    • http://siwupojotuj.getenjoyment.net/77719274206.pdf
    • http://mizizufiku.mywebcommunity.org/aspiration_pneumonitis_and_aspiration_pneumonia.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://begujewirefe.myartsonline.com/oxford_latin_dictionary_abbreviations.pdf
    • https://s3.amazonaws.com/zetubakuz/kixavozarajupejorimeted.pdf
    • https://s3.amazonaws.com/dogazisuze/32081082485.pdf
    • https://s3.amazonaws.com/vapite/dixilaxaxeji.pdf
    • https://s3.amazonaws.com/waduzirader/bosch_obd_1050_mobile_smartphone_vehicle_diagnostics.pdf
    • https://ac6a5e95-3fab-4d4b-a7e7-0ef4c71e5929.filesusr.com/ugd/32c278_5c11e538479c47bdb3f687d152b0268b.pdf?index=true
    • https://fb1cd387-549b-40f1-a5a4-67fd65d29bb3.filesusr.com/ugd/4200b4_18e0c0b4464d43e994b558c84e5f9dd6.pdf?index=true
    • https://ed0f7819-48b4-4c0d-9119-93de03d81b9c.filesusr.com/ugd/e481ce_65fef51230064c3e95e1d5a1c56d7391.pdf?index=true
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_ff4dfacd421c465eb7d6fe5083b18ad9.pdf?index=true
    • http://zitulogakapede.myartsonline.com/castle_on_the_hill_piano_sheet_music_free.pdf
    • http://tonavisuma.onlinewebshop.net/tifibokoxip.pdf
    • https://s3.amazonaws.com/getizar/love_greeting_card_template_christmas.pdf
    • http://zejibanunepi.myartsonline.com/novimojesitewepowufibomuk.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecfd.bin
54598a4c14a4d643714353408bea6604be3b829f99b7ccb4b39694f18d31ba06		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECFD 5452 bytes
font_01_sfnt_off0000ff98.bin
bd15ce87bd50a6b30c12dbeba473ee3f98dbf6a42d64945da8f84568219e3c1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF98 10916 bytes
font_02_sfnt_off000124fe.bin
7dee3d35347b5a23c52c49b4c926820c9082d57826c8940644ad750c84ee82d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124FE 17880 bytes

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