Malicious PDF — malware analysis report

Static analysis result for SHA-256 e189d24f1599d33f…

MALICIOUS

PDF

77.8 KB Created: 2021-03-23 12:26:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef1e66c1fe6574a8e323c5de3fb1c601 SHA-1: 553054f4c2117d509d7c24fa3d4b9ab0f0b816e3 SHA-256: e189d24f1599d33fa10f5d103e151274786088cda9d93d364aaa3730ea5481b1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical PDF_SEO_LINK_FARM rule, indicating it contains a mass of external links. The ML classifier and ClamAV also strongly suggest maliciousness. The primary purpose appears to be directing users to a large collection of other PDFs hosted on various platforms, likely as part of a link farm or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wix?keyword=8+oz+chicken+breast+in+oven
    • https://wexejejide.weebly.com/uploads/1/3/3/9/133986252/08201bf.pdf
    • https://cdn-cms.f-static.net/uploads/4420451/normal_6020273f952b3.pdf
    • http://pawarelubasiwu.iblogger.org/mugodiwizibunajaw.pdf
    • http://xuvepawa.iblogger.org/pavatoxevurojeloj.pdf
    • https://static.s123-cdn-static.com/uploads/4379387/normal_5feb2a2f4169d.pdf
    • https://mojabizozawobe.weebly.com/uploads/1/3/4/6/134699592/gubikudebunafu-norujekepefo-mejusujoni.pdf
    • https://rawiranuxox.weebly.com/uploads/1/3/4/6/134618620/7169b0e11418.pdf
    • https://cdn.sqhk.co/derepinejabi/ggjDBid/water_wheel_knife_sharpener.pdf
    • https://static.s123-cdn-static.com/uploads/4471945/normal_5fc9c1add3779.pdf
    • https://cdn-cms.f-static.net/uploads/4481408/normal_601a7e040d152.pdf
    • https://cdn-cms.f-static.net/uploads/4444644/normal_604645afb9312.pdf
    • https://cdn.sqhk.co/jebumujo/921x7yv/pac_man_table_arcade_game_for_sale.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kokegewabero.rf.gd/74198984776.pdf
    • https://uploads.strikinglycdn.com/files/85d79dcd-bcea-4e95-9abe-e4997b436556/simcity_4_how_to_get_commercial_skyscrapers.pdf
    • https://uploads.strikinglycdn.com/files/ad7f4d19-7b85-4f2b-bb4f-9da32477328c/survival_servers_minecraft_pe_india.pdf
    • https://uploads.strikinglycdn.com/files/6a98e6ba-920e-42c5-ae15-cdb757b978e8/harbor_breeze_ceiling_fan_light_kit_removal.pdf
    • https://uploads.strikinglycdn.com/files/3f2275fd-d13d-4be2-9c1a-72da69176558/how_to_change_a_wick_in_a_square_kerosene_heater.pdf
    • https://uploads.strikinglycdn.com/files/a9b8d4cd-c60a-42a0-bb72-94782b70f6b3/trigonometry_formulas_list_for_class_11_download.pdf
    • https://uploads.strikinglycdn.com/files/edc277d1-7b6f-4145-91ba-779d38556561/el_dador_de_la_vida_biblia.pdf
    • https://uploads.strikinglycdn.com/files/307eb200-ed4b-482f-843f-764e37b86593/what_is_the_best_brand_of_recumbent_exercise_bike.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_off0000f163.bin
1125da9de02bc567eeeeacd92656bec91d7a8b3e33c1671c6ca34a5a115b93ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF163 5268 bytes
font_01_sfnt_off00010353.bin
dc83db1a7760f120a85d31e25e1bf4410916581eca42466b7a4993d0977cc8d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10353 10884 bytes

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