Malicious PDF — malware analysis report

Static analysis result for SHA-256 748cf5d06a75943d…

MALICIOUS

PDF

111.8 KB Created: 2021-01-15 21:30:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 2d4c59f785e580c69513d89ea687f711 SHA-1: b6a9c8630812833edfa0329c5511c879914ea546 SHA-256: 748cf5d06a75943d404f87ced65d41cdccf531b54bb2b1ddeb76dbda567da902
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was identified as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, with one heuristic specifically flagging it as a 'PDF_SEO_LINK_FARM'. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest a phishing or SEO manipulation scheme. The primary IOC is the external URI pointing to 'trafffi.ru'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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=what+stage+of+product+life+cycle+is+starbucks PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4378836/normal_5ffb21ebbef66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424341/normal_5fbd532fb56d0.pdfIn PDF document text
    • https://wibejimexog.weebly.com/uploads/1/3/4/4/134466339/e38e6d6.pdfIn PDF document text
    • https://lumovomudin.weebly.com/uploads/1/3/4/7/134704265/ragojoz.pdfIn PDF document text
    • https://dikemogegopur.weebly.com/uploads/1/3/1/4/131406608/muzuveke-lakukibutikir-pazizopi-robidinoten.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421038/normal_5fa646718a13e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455645/normal_5fa6608eabc62.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459467/normal_5fc9325d9455f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374980/normal_5ff78488b52c3.pdfIn PDF document text
    • https://lidovoji.weebly.com/uploads/1/3/4/3/134313359/nebomejuviju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369763/normal_5f8fdc026e0a0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jasadavebaga/junior_programmer_cv_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/hd_movies_website_quora.pdfIn PDF document text
    • https://s3.amazonaws.com/timafatafej/unblocked_games_papa_games.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/ardaas_karan_2019_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/free_lightroom_mobile_presets.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/assam_tribune.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/english_dictionary_word_meaning.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A9F 5512 bytes
SHA-256: 3771b0e0049e9d18228769a90672778f95bb078a587e1a949a1b1606c7c5cbb4
font_01_sfnt_off00017d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D8A 11196 bytes
SHA-256: bccf520a524af213f5fab9919ea67bc6f58948486937bf589922fcd31fe7117c
font_02_sfnt_off0001a345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A345 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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