Malicious PDF — malware analysis report

Static analysis result for SHA-256 d58a6d0dcf630fb9…

MALICIOUS

PDF

61.6 KB Created: 2020-11-18 19:16:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 8cedef8b889dbfef0a5943f3b45af0d9 SHA-1: d21fe0c155bf14759eeabe0789f8b341e1c8e295 SHA-256: d58a6d0dcf630fb9a84045775048bfb82829a97f2462432ad7dd2d1a89568c6f
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The embedded content suggests a lure related to 'clickplay time 6 answers'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for redirecting users to malicious sites or for ad-fraud. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/123?utm_term=clickplay+time+6+answers PDF link annotation
    • https://vaxajiwozoli.weebly.com/uploads/1/3/1/6/131637631/xixug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368748/normal_5f905e4429932.pdfIn PDF document text
    • https://fevapeju.weebly.com/uploads/1/3/4/4/134468187/711c14b41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371806/normal_5f89b2bce18b8.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/detif.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/kezedivalo-bolumukejufufik.pdfIn PDF document text
    • https://nixawajumumija.weebly.com/uploads/1/3/4/3/134338940/6066495.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410431/normal_5fa11927150ea.pdfIn PDF document text
    • https://vudivopaf.weebly.com/uploads/1/3/4/8/134876542/jupanatukizoroj.pdfIn PDF document text
    • https://bozobamawokoruv.weebly.com/uploads/1/3/4/3/134350924/dotalamukozekatil.pdfIn PDF document text
    • https://vafumigoku.weebly.com/uploads/1/3/1/3/131384305/mozes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403531/normal_5f94c66a6c1bb.pdfIn PDF document text
    • https://gukaguse.weebly.com/uploads/1/3/1/3/131398473/zomupijozoku.pdfIn PDF document text
    • https://livaganomin.weebly.com/uploads/1/3/4/3/134399079/kimunokefimawo_kukenapogijape_kesetubov_tulimo.pdfIn PDF document text
    • https://simidolipuxemit.weebly.com/uploads/1/3/4/4/134486986/lufuforijibesax-pexajukakodason-vutodavive-wivavepe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000b507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB507 5396 bytes
SHA-256: e52d9117b3176e006cf95e80cd4fce7f83232211302716de329884b4d1b8f30b
font_01_sfnt_off0000c763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC763 10136 bytes
SHA-256: f0e437cf64abcfe683c0a62087b50546c9c2cfe9e3b30014604577686b327549

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