Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbd4bbb54b956552…

MALICIOUS

PDF

81.2 KB Created: 2021-02-26 04:53:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e20acbb84ff99a9d0db56183114cca08 SHA-1: 24e2a9ad70a2f2ad417b4e1727b4235ea23bb41b SHA-256: bbd4bbb54b956552cd975b067e1f90032f5463e16fb8c31cb9c21d25ab9171f7
214 Risk Score

Malware Insights

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

The sample is a PDF file flagged as malicious by ClamAV and an ML classifier. It contains a significant number of embedded URLs, with at least one identified as a malicious redirector and others forming a link farm. The document body appears to be malformed or obfuscated, but the presence of numerous external links suggests an attempt to manipulate search engine results or redirect users to malicious content.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wb?keyword=the%20castle%20kafka%20sparknotes In PDF document text
    • https://pejejejepo.weebly.com/uploads/1/3/2/6/132682076/zofurovunufavepuk.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/tafibenovopozire.pdfIn PDF document text
    • https://cdn.sqhk.co/kimazibo/sic2Fih/space_warriors_sci-_fi_strategy_combat_games.pdfIn PDF document text
    • https://cdn.sqhk.co/vibesadebo/ldHheqv/free_wifi_booster_app_for_pc.pdfIn PDF document text
    • http://jalazekesofijot.medianewsonline.com/wadepiboti.pdfIn PDF document text
    • http://gagimubu.mywebcommunity.org/delirium_series_order_to_read.pdfIn PDF document text
    • https://cdn.sqhk.co/xovujiroveg/oMjghjj/kidajanepakusuwixage.pdfIn PDF document text
    • https://cdn.sqhk.co/ganinidunop/jS7Fha5/light_up_fidget_spinner_battery_replacement.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xajowu/55328048062.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/heat_and_mass_transfer_cengel_4th_edition_solution_manual_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/uji_non_parametrik.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/14980256256.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/naming_ceremony_invitation_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tomaxade/danimamezorutadenunoxeli.pdfIn PDF document text
    • http://gosaduzunake.myartsonline.com/barrons_sat_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xapota/rowif.pdfIn PDF document text
    • http://fubavinexazixo.onlinewebshop.net/84192616971.pdfIn PDF document text
    • http://namepafubi.atwebpages.com/vermont_service_center_email_address.pdfIn PDF document text
    • http://tuzuxutetug.atwebpages.com/nofatusiwedipikesilepakep.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62D 4856 bytes
SHA-256: 19471bb371e47b944c2ada24753aa1bd30d38bfe2ff12da4db7d43ea6855f6df
font_01_sfnt_off0001069f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069F 10292 bytes
SHA-256: 670a0162c471c3e7499d450ed75813c71c9e8e059c3f8578f7faec47a831c01f
font_02_sfnt_off000129cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CD 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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