Malicious PDF — malware analysis report

Static analysis result for SHA-256 9990cba171ca47ae…

MALICIOUS

PDF

75.6 KB Created: 2021-03-19 09:40:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0b2b861c3cb7f943052fd7cb3fc39d82 SHA-1: 70ba135b28422249b1c2389a8d9ccaf101ff5c3a SHA-256: 9990cba171ca47ae9e0ab8e4a7ed81456cfc09a7fcd1de2f76c506064949caf7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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://bologen.ru/123?utm_term=caldera+forms+to+google+sheets PDF link annotation
    • http://discount50.pro/2748093813788ag6.pdfIn PDF document text
    • https://cdn.sqhk.co/liregevo/hig09hc/roreliful.pdfIn PDF document text
    • http://graatorama.space/cara_menggunakan_aplikasi_personal_sticker_for_whatsappg0l2s.pdfIn PDF document text
    • http://salonapp.xyz/warhammer_40k_codex_8th_editionq2a17.pdfIn PDF document text
    • https://bewodopogogubak.weebly.com/uploads/1/3/4/8/134886142/8cf8391b0f.pdfIn PDF document text
    • https://zesaxigupube.weebly.com/uploads/1/3/4/0/134016892/2825737.pdfIn PDF document text
    • http://ogranifruit.space/adobe_illustrator_10uz7kn.pdfIn PDF document text
    • https://cdn.sqhk.co/dolitife/3EBPicM/civ_6_indonesia_guide_rise_and_fall.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/46032913-8e7d-4683-944c-c7b6283fd9b1/56809874517.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/kurepelapujitizenakape.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/454a5fbc-a801-4760-a3a4-59261204fedd/starcraft_2_units_protoss.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/fawirorojet.pdfIn PDF document text
    • http://deneboruw.rf.gd/pububiriviworawofakidip.pdfIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/egress_secure_workspace_user_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4297b7b-5185-4208-ac55-71c7bb943172/95657241906.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f9cf2d3-05d4-4197-87ad-fa40586ce419/dir-655_default_ip_password.pdfIn PDF document text
    • http://viwixalos.epizy.com/vunobawasuropugadanu.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/74561228078.pdfIn PDF document text
    • http://fosekor.epizy.com/bepuxuguwofilasilowol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0bd8664-df96-426d-977c-cc290cba5f38/besawopukejukeled.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_off0000ea10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA10 5228 bytes
SHA-256: 2d6f72f1449efad307a36dc61d5aeaedb7838e302adcd96e7c6b416469e6fc22
font_01_sfnt_off0000fba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA6 10968 bytes
SHA-256: a43a2c2588c1043c5a2ee3f1d7905c10cbb0da97d2d633a75f7951da142407bd

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