Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bbcb19ac4a6ddde…

MALICIOUS

PDF

80.4 KB Created: 2021-05-20 12:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f73a6bb0bef3a660ebe0871bb26f1848 SHA-1: 588778a2fa4b1aac0be48bcb643370d6b66cbd60 SHA-256: 3bbcb19ac4a6ddde49719398bc810d518148edb0dcc0b1b53a1abd3367d1a8b3
226 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. It uses a password-protected-archive lure. 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 0.9993

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://xajibur.ru/strik?utm_term=como+se+escribe+haya+alla+o+aya PDF link annotation
    • https://pelefazefipaguj.weebly.com/uploads/1/3/4/8/134892892/bizexon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384143/normal_6032aab1d8c17.pdfIn PDF document text
    • https://mokasinerosun.weebly.com/uploads/1/3/2/6/132682676/sufabuzasamepapav.pdfIn PDF document text
    • https://mevavenepid.weebly.com/uploads/1/3/1/6/131637679/6777738.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474759/normal_5fcc71551e002.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500447/normal_600512a26d5d9.pdfIn PDF document text
    • https://fugesozuxi.weebly.com/uploads/1/3/0/7/130739141/f7e6f7e42900f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459468/normal_603d8a1635fdb.pdfIn PDF document text
    • https://pukefigagarit.weebly.com/uploads/1/3/1/4/131406744/rupalu_zujajolabaweb_fazunezupo_bedib.pdfIn PDF document text
    • https://lubozukutiximik.weebly.com/uploads/1/3/4/4/134472848/pamenuro-wedikoresevore-sagizatof.pdfIn PDF document text
    • https://gojesewemuvi.weebly.com/uploads/1/3/2/6/132681304/sikakemavuw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474223/normal_5fc888fa046c4.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/f6628923-5201-4e77-a266-1907823cc4a7/hard_reset_polaroid_tablet_without_volume_keys.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0368ca16-5507-406a-a7a4-b3b189a9d1de/nelson_handwriting_sheets_year_3.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/jukosufevutaxumibiriwuxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57a5ce19-c139-4968-9766-71378749f6bc/john_deere_750_tractor_for_sale_craigslist.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e4eadcd-2d7d-46ae-9e6b-892662beedb0/why_is_my_washing_machine_not_taking_in_water.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6319c359-9db0-4fb1-ac82-a2f11cfdd6a8/casio_g_shock_manual_time_set.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1744d13b-bff5-4e52-9773-829a8fb9cf52/59563419080.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/dc_gloves_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zafirawit/how_to_drain_gas_from_honda_rancher.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d463157e-41b1-488a-941c-c4803317f528/d_link_dir_615_problems_wlan_password.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f837c3e8-e4cd-4714-85c1-d7e8f2d4bd27/33925036167.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e45253c-2b04-4d4a-8447-f2075ba6af10/85649267544.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/422015ed-73d7-4a4a-bdac-48d6f81433e5/5_love_languages_for_singles_book.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_off0000f934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF934 5188 bytes
SHA-256: 2cff569a26853ee9735ee6828fb0d5dc7aedc1cb1fc12a4168302f04c3b04713
font_01_sfnt_off00010ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB0 12560 bytes
SHA-256: 5c4613ed19ab01b891657eae7d3b296938354e4fd7a9393a9b7129421435952b