Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc78b446b41289a…

MALICIOUS

PDF

118.3 KB Created: 2021-06-11 16:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d9df16c0e8b09878b39d86a09306bd49 SHA-1: 337b33431aca20b01353425f43bfa4a20754d12b SHA-256: efc78b446b41289a53c5cd6e3208337d80a5ae51b07d6c30e706b51ae0009291
266 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File Execution: User Execution

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. Crucially, it employs social engineering lures like 'ClickFix' and 'Clipboard command execution' to trick users into running commands directly, likely to download and execute a secondary payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 8

  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://philabc.ru/pbw?utm_term=git+force+revert+to+previous+commit PDF link annotation
    • https://rutukesusejam.weebly.com/uploads/1/3/4/4/134464581/tukexa-xamunix-fubeza.pdfIn PDF document text
    • https://tafulagi.weebly.com/uploads/1/3/4/6/134608062/jedomozow.pdfIn PDF document text
    • https://kemudebudejel.weebly.com/uploads/1/3/4/7/134718551/benawifilemudawarot.pdfIn PDF document text
    • https://ranazujip.weebly.com/uploads/1/3/5/3/135398887/bigebexonen.pdfIn PDF document text
    • https://buneresax.weebly.com/uploads/1/3/4/4/134478328/xemezug.pdfIn PDF document text
    • https://benofafixumiwif.weebly.com/uploads/1/3/4/4/134497886/rojij-manade.pdfIn PDF document text
    • https://gekalizafazidej.weebly.com/uploads/1/3/4/6/134699032/d4b51295e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fafevupu.pbworks.com/w/file/fetch/144833298/muvobit.pdfIn PDF document text
    • http://nitezug.pbworks.com/f/60206351293.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d561984-a539-44f2-87fd-09f9ecf0d7cc/bumilibova.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daa71cff-67d6-4bf7-9b36-a53ca58a63a8/tawamosapa.pdfIn PDF document text
    • http://xovakovawup.pbworks.com/w/file/fetch/144521361/is_gluten_free_food_good_for_keto_diet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b6f0046-defa-44e6-9d54-61596c8474e9/how_to_change_the_battery_in_a_black_diamond_headlamp.pdfIn PDF document text
    • http://vodopaw.pbworks.com/f/nexus_trap_presets.pdfIn PDF document text
    • http://zuvuzut.pbworks.com/w/file/fetch/144932379/xforce_keygen_autocad_2008_64_bit.pdfIn PDF document text
    • http://vomuseteweto.pbworks.com/f/6774026047.pdfIn PDF document text
    • http://wipadewor.pbworks.com/w/file/fetch/144993948/poxetofivonowefir.pdfIn PDF document text
    • http://mulasamesi.pbworks.com/f/gta_trk_city_v3_apk_indir.pdfIn PDF document text
    • http://dumunivuniv.pbworks.com/w/file/fetch/145128774/euro_truck_simulator_2_download_android_game.pdfIn PDF document text
    • http://movovepavuzi.pbworks.com/f/mahabharata_full_story_in_kannada_free_download.pdfIn PDF document text
    • http://zizalojuwe.pbworks.com/w/file/fetch/144991833/neragigi.pdfIn PDF document text
    • http://jasiduvegulu.pbworks.com/w/file/fetch/144602022/how_to_detonate_tnt_in_minecraft_pi.pdfIn PDF document text
    • http://dewubuk.pbworks.com/w/file/fetch/145090467/30832035891.pdfIn PDF document text
    • http://sozakuvepar.pbworks.com/w/file/fetch/144507372/xatapebigopozebiwerile.pdfIn PDF document text
    • http://jabevexizoj.pbworks.com/w/file/fetch/144784437/dictados_sexto_de_primaria.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_off00018f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F9F 5008 bytes
SHA-256: 4e109771bcc9aa25b0bd572dda7ecb0fa9a323bc1b2d5e934d37c16806eb35bb
font_01_sfnt_off0001a0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0AB 12560 bytes
SHA-256: 26b594cf5617f54b1db55069520b102de078ce97e88538d926d3014311bcd7ef