Malicious PDF — malware analysis report

Static analysis result for SHA-256 91648a5940d8f1f4…

MALICIOUS

PDF

69.7 KB Created: 2021-03-26 11:40:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e852bf1f2da06adb3dd74e718533cf9b SHA-1: a5294448b14c780a437b575dc476193a8df51479 SHA-256: 91648a5940d8f1f47bf5e49d2d30159dea92464d74512afb2acacc13361a1559
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://golowaki.ru/strik?utm_term=icom+ic+706+mk2+manual PDF link annotation
    • https://zakonuvuluj.weebly.com/uploads/1/3/5/9/135984705/2d4ee5d70444f01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379626/normal_5fe79d2e10ded.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/holmes_and_rahe_stress_scale_calculator.pdfIn PDF document text
    • https://cdn.sqhk.co/jakatote/Kjcf3Ob/92187069973.pdfIn PDF document text
    • https://cdn.sqhk.co/dutararopat/ijieQ9W/slide_master_3d_models.pdfIn PDF document text
    • http://dipazekonowa.mypressonline.com/warcraft_chronicles_of_war.pdfIn PDF document text
    • http://sikazigazes.mypressonline.com/medical_virology_book.pdfIn PDF document text
    • http://gazizelasama.getenjoyment.net/vampire_the_masquerade_5th_edition_core_book_download_free.pdfIn PDF document text
    • https://jaluvipuruwagub.weebly.com/uploads/1/3/4/7/134734890/794e81d1d85.pdfIn PDF document text
    • https://cdn.sqhk.co/rorajakura/ercgidO/4d_hd_wallpaper_2020_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367281/normal_6052fbf022106.pdfIn PDF document text
    • https://xekafifem.weebly.com/uploads/1/3/4/6/134669887/tosewenoruxodi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418013/normal_60427145e6af6.pdfIn PDF document text
    • https://cdn.sqhk.co/gabadifofibo/ujcieUO/bisuperinogiwadolir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388169/normal_5fee2f1c01d68.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390052/normal_5ff77aacf17be.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/584b28f6-d42d-4198-8f80-6c3f4c7abc66/ls_dyna_keyword_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8067ea1c-aec4-495b-bfc1-26d3ae55fe2d/confession_of_a_shopaholic_soundtrack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c53fe59-247a-4aca-b505-e847f6146eef/10880124232.pdfIn PDF document text
    • http://fepusum.onlinewebshop.net/case_study_design.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f9b0841-ef98-4994-803f-f95cef2611c1/you_can_now_play_cards_against_humanity_online_with_your_mates.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_off0000d43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43E 5180 bytes
SHA-256: 02d2d362c73007a6b30019dea35dd69fa99514ec8a04f526c896e544aeca92d4
font_01_sfnt_off0000e5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E2 10612 bytes
SHA-256: 777059e9112054d8a33c5ec96fc522e0826618715cfa105310a43c03ac41221d