Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c6b3a78f250d848…

MALICIOUS

PDF

84.3 KB Created: 2021-03-25 10:11:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 461e0d800a8a9fb1dc8836384bfee484 SHA-1: 3944c3fdecfbb376d913e2a13025114fa7367413 SHA-256: 9c6b3a78f250d848b0974bcd73ed1245184ed87099a080dea0337d9ea9677026
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • 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://druttle.ru/strik?utm_term=islamic+name+meaning+bangla+apk PDF link annotation
    • https://fipowawebes.weebly.com/uploads/1/3/4/6/134601566/9358511.pdfIn PDF document text
    • https://duresanu.weebly.com/uploads/1/3/5/3/135334900/dopemujubinuki_nanajevukujaju_jejadimeboxiba_silejut.pdfIn PDF document text
    • http://crawlmqyu.space/android_tv_games_for_2_playerso5a3j.pdfIn PDF document text
    • http://lawyer-consult.ru/vibudibemumunesitopu7nxs.pdfIn PDF document text
    • http://lazategomid.scienceontheweb.net/wugode.pdfIn PDF document text
    • https://nakixeke.weebly.com/uploads/1/3/4/3/134354053/6108966.pdfIn PDF document text
    • http://creditstar-kabinet.com/27417080218gnf7q.pdfIn PDF document text
    • https://mazoguwikite.weebly.com/uploads/1/3/4/6/134614920/fituxafagudix_jezeboro_noluseri_rajusofumemu.pdfIn PDF document text
    • http://birebap.scienceontheweb.net/56563752929.pdfIn PDF document text
    • https://sezijaxafiv.weebly.com/uploads/1/3/1/6/131637080/peziwekoja-rezulabe-jigejilexinuri-wutewe.pdfIn PDF document text
    • https://zirilomeme.weebly.com/uploads/1/3/6/0/136025267/4695931.pdfIn PDF document text
    • https://gazufasuro.weebly.com/uploads/1/3/4/4/134482956/ea210d1bcdbeac.pdfIn PDF document text
    • https://digokevun.weebly.com/uploads/1/3/4/7/134747151/wetakesozew-fagabubu-guroreviti.pdfIn PDF document text
    • http://raxejudesezix.scienceontheweb.net/diary_of_a_wimpy_kid_old_school_read_online_free.pdfIn PDF document text
    • https://finolija.weebly.com/uploads/1/3/4/6/134625313/zoxililug.pdfIn PDF document text
    • http://winclean-shop.space/nortel_meridian_m3904_phone_manualufx3y.pdfIn PDF document text
    • https://puwibovur.weebly.com/uploads/1/3/4/6/134639487/338d8cf9c3fd422.pdfIn PDF document text
    • http://bavimobuxadu.medianewsonline.com/simomerobazinawaretoxote.pdfIn PDF document text
    • http://silkhfig.bid/sato_cl4nx_not_printing943g8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1c54689f-8f60-44d8-8d81-b144d6ea8ada.filesusr.com/ugd/787b0a_ab70d1ed43bc4c36b5371c5731be9a60.pdf?index=trueIn PDF document text
    • https://3e3188f7-d9e9-48da-9af6-4e6760718ee0.filesusr.com/ugd/4f7562_0763be5ea92842ce81bfceec69f7bde2.pdf?index=trueIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_eac82406a6084436a5415d517f3a5195.pdf?index=trueIn PDF document text
    • https://620678a0-8f5b-407b-881a-8a96a128c1c4.filesusr.com/ugd/25b7a6_edc1b6df8c814d9fbe97c869c8c560b9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ef90ca3-d9ad-468b-937e-ab201a111014/dieta_fodmap_lista_de_alimentos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1876b51-1313-4ef4-8a77-22228cfd1d8a/norapigison.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adbaa6e9-9b68-4af7-b2ba-ed9e486a3d25/jotegonami.pdfIn PDF document text
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_895ba286a6d4461a801757f9e10c2529.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e511c123-b166-4698-a013-c5be7e94917f/defixobowufibo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8484f608-9e16-41b6-bd55-bfb115c71333/36031294884.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE733 5296 bytes
SHA-256: be3c192cc601188ab7a7481c30e124996d51f3805b8f638b27c75c7262edadb3
font_01_sfnt_off0000f92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92A 12304 bytes
SHA-256: 5220cbcf3662e777d23f1344aa15e37940757f3be85e0d4363553c793de2757c
font_02_sfnt_off00011e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3D 10612 bytes
SHA-256: 1126ae8a8b83d8ec82e536a23055b99ab04e281f2ea52886b36492cc33bd844d