Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ba08bb8e4bf034a…

MALICIOUS

PDF

76.2 KB Created: 2021-03-04 00:27:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: da47782b296ec5a9b658b0dd65153094 SHA-1: d807b64eb02dbeaff8a8a63b21b34fe2f4b19036 SHA-256: 4ba08bb8e4bf034ac357bfaa18286211e5682733973cea765f48a5e98d6d4d54
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 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/123?utm_term=introduction+to+biblical+interpretation+-+workbook+pdf PDF link annotation
    • https://nesexabaxurozij.weebly.com/uploads/1/3/4/8/134898102/damoves-balujire.pdfIn PDF document text
    • https://cdn.sqhk.co/gujipiror/hmjgzex/87683056860.pdfIn PDF document text
    • https://povurumupun.weebly.com/uploads/1/3/4/8/134884194/nofokigovuzuzegaze.pdfIn PDF document text
    • https://cdn.sqhk.co/wolonevavaru/hiegegj/cartoon_network_articles.pdfIn PDF document text
    • https://cdn.sqhk.co/nomelafu/hcuOHia/44370821277.pdfIn PDF document text
    • http://juilopkiretlo.ru/ariens_28_deluxe_sho_reviewh0sd1.pdfIn PDF document text
    • http://shop-onlinediscount.xyz/begin_again_mona_kasten_espaol9fo9h.pdfIn PDF document text
    • https://natedutaz.weebly.com/uploads/1/3/4/8/134850225/mibixaferenetezi.pdfIn PDF document text
    • http://misstourist.info/wexalodatapekatewofudedezwk6h.pdfIn PDF document text
    • https://cdn.sqhk.co/zesojesiwi/getwN16/house_life_3d_app.pdfIn PDF document text
    • https://cdn.sqhk.co/butemobe/i7fieZM/65776677254.pdfIn PDF document text
    • http://kurs1.xyz/ccss_math_2nd_grade_measurementk8ngm.pdfIn PDF document text
    • https://cdn.sqhk.co/kupujape/giyTLG7/sowutoberuwijojudus.pdfIn PDF document text
    • https://niraniki.weebly.com/uploads/1/3/4/6/134662237/diwujakosi_feguripofawa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xetixeguxiji.epizy.com/sephora_walt_whitman_mall_hours.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_off0000ebf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF0 5236 bytes
SHA-256: e08984a0d44bd1bb38d4050228274589dbea85a751c679d7c98f0091f3837602
font_01_sfnt_off0000fde9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE9 10976 bytes
SHA-256: 40f9cd6499009a8849edf80a043be4f43fe652d1d1adefe20eaccb8c9b95493d

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