Malicious PDF — malware analysis report

Static analysis result for SHA-256 18c4db0c5a47847d…

MALICIOUS

PDF

78.7 KB Created: 2021-06-01 06:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 34fdd277def01cbb38fa85b2afd08dd8 SHA-1: 80cdc297ae481c0cad54e48442ee92af4f917bae SHA-256: 18c4db0c5a47847d8dd901583699e6bb93a2aaa4778050be3493a6ead46228de
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 0.9997

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://xezojetit.ru/123?utm_term=cessna+152+checklist+checkmate+pdf PDF link annotation
    • https://kipowiginudi.weebly.com/uploads/1/3/1/3/131383469/kasosuwur.pdfIn PDF document text
    • https://lifezubolafa.weebly.com/uploads/1/3/4/7/134715310/5c41a47.pdfIn PDF document text
    • https://damasidegiked.weebly.com/uploads/1/3/1/4/131411688/sevajivewupupij_tuligetud.pdfIn PDF document text
    • https://memarexegota.weebly.com/uploads/1/3/4/3/134366516/dfb3ab6.pdfIn PDF document text
    • https://goxezisofira.weebly.com/uploads/1/3/4/8/134887941/rodebeb-nobuxogokem-diduniloto.pdfIn PDF document text
    • https://jinugavov.weebly.com/uploads/1/3/4/4/134438703/6745812.pdfIn PDF document text
    • https://lixibagiz.weebly.com/uploads/1/3/5/3/135348296/kirupud.pdfIn PDF document text
    • https://fopozawiluni.weebly.com/uploads/1/3/4/3/134383369/6888683.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/a070c829-d44b-4c81-8fe3-2c6c22d057ea/tukupusidunimerijipakolaj.pdfIn PDF document text
    • http://mifimoruzuwo.pbworks.com/f/k53_road_signs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8904859-3c46-48a0-81b5-ff30a1f2ac18/lafosozukeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c24fe22c-7268-41c0-9264-022ea0a03af0/muguto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7d003ab-b4a2-4b4e-aad1-741cb8ad75b7/dna_fingerprinting_activity_worksheet_answers.pdfIn PDF document text
    • http://visetululiv.pbworks.com/f/stick_fight_archer_mod_apk_unlimited_money.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/867208bb-462c-494b-8da3-15862761d09d/dewalt_cordless_tool_set_lowes.pdfIn PDF document text
    • http://nunaruribeg.pbworks.com/w/file/fetch/144415362/45084523708.pdfIn PDF document text
    • http://gazumadu.pbworks.com/f/how_do_you_say_sacroiliac_joint_dysfunction_in_spanish.pdfIn PDF document text
    • http://tazijebep.pbworks.com/w/file/fetch/144419616/21294455551.pdfIn PDF document text
    • http://dipoziw.pbworks.com/w/file/fetch/144439860/vazip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b38bbcf-6612-4362-bde8-4d2b92442cfb/sefenufizasolux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e0dfd90-9814-4d26-864b-21a0ee7bffdc/20144342862.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_off0000f2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AE 5576 bytes
SHA-256: 0787f1818d3ad2ed0f2be847fca0bcffe833fd3196e074ae2282432b84e8b816
font_01_sfnt_off00010589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10589 11940 bytes
SHA-256: f58929913cc54c3adf36558ec116a563edd506d9cc83b2c0db828f1c580440f6