Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf6768fc50873d1…

MALICIOUS

PDF

87.9 KB Created: 2021-03-21 04:27:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f9afca220db54397860bc048f870ffca SHA-1: 9eb39123aeccf74428bb9191fa14b95b7e9bd9e8 SHA-256: 7bf6768fc50873d167c1f5bfb26096c34d93ba8028edf369bd700812d0f673d2
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 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/123?utm_term=green+river+fishing+report+2019+washington+state PDF link annotation
    • http://xawexusinuzo.22web.org/sigiluwixuvepuku.pdfIn PDF document text
    • http://pomuropujuj.22web.org/sudojomitaligigujofi.pdfIn PDF document text
    • https://cdn.sqhk.co/bozutebux/di8rcgd/lagobavowawuxovezu.pdfIn PDF document text
    • https://cdn.sqhk.co/reromiwo/FU7hbfY/hearts_on_fire_stackable_rings.pdfIn PDF document text
    • http://dapurixid.sportsontheweb.net/livofodisegodon.pdfIn PDF document text
    • https://cdn.sqhk.co/sononipo/idhdOja/steam_consumption_calculator_online.pdfIn PDF document text
    • https://xutezanepone.weebly.com/uploads/1/3/3/9/133999331/7930962.pdfIn PDF document text
    • https://cdn.sqhk.co/gotuxixovumu/haidgib/pogomozopotazaditu.pdfIn PDF document text
    • http://rakomakefike.iblogger.org/dofe_volunteering_assessors_report_example.pdfIn PDF document text
    • http://sutiwejepeb.22web.org/40776491729.pdfIn PDF document text
    • https://cdn.sqhk.co/ragojagef/jgBdnK2/59760469935.pdfIn PDF document text
    • https://cdn.sqhk.co/molavagew/idhhhf6/schema_electrique_voiturette_ezgo.pdfIn PDF document text
    • https://cdn.sqhk.co/guvelebul/esgngcH/swordman_reforged_mod_apk_latest_version.pdfIn PDF document text
    • https://rorezumi.weebly.com/uploads/1/3/4/5/134591247/2657372.pdfIn PDF document text
    • https://resodarapasak.weebly.com/uploads/1/3/4/6/134659305/f6f8b994.pdfIn PDF document text
    • http://rinotox.iblogger.org/2501246526.pdfIn PDF document text
    • https://wugepugozufov.weebly.com/uploads/1/3/4/7/134744675/b85c46824d9e.pdfIn PDF document text
    • http://fuxanujibiz.mygamesonline.org/97938278302.pdfIn PDF document text
    • https://xofeboje.weebly.com/uploads/1/3/4/5/134584890/5bbd9386d065b4.pdfIn PDF document text
    • https://cdn.sqhk.co/kupejabel/EKg9hhm/equalizer_ultra_pro_app_download.pdfIn PDF document text
    • http://gufurebu.medianewsonline.com/basic_boating_knots_that_everyone_should_know.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://uploads.strikinglycdn.com/files/1f747945-fa7b-4388-b5ef-66a24dcf1c06/10629964940.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95417990-274d-494b-89ef-9c0c9bdc516c/can_i_change_my_name_on_my_marriage_license.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5879e371-6d4c-4cfa-9626-2bac9ee55d41/barrons_ap_environmental_science_8th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e9ab57d-8a94-451d-8503-b4d7773e6c21/43312251060.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_off00010857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10857 5584 bytes
SHA-256: d31620375cbe87eb32e3c23992fb8598733fd1400a9572250919b89957c495c4
font_01_sfnt_off00011b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6B 10972 bytes
SHA-256: 964c1644b1d79efedcd6807eb3f69cd3dbf8d032045b7dcfc35b28d47540b552
font_02_sfnt_off0001410f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1410F 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34