Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf0c0e849732ab40…

MALICIOUS

PDF

75.0 KB Created: 2021-02-20 16:47:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 31a1583c0e4a38fd0517440ba4d95725 SHA-1: 2b6f432814a72315718416603a32f1ed32b1313b SHA-256: bf0c0e849732ab4037257335721f60b0f4960f41a2dd71df698a073daa9dfa3e
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or malware delivery attempt. It contains numerous external links, with a prominent one pointing to 'jottigo.ru', which is identified as an SEO redirector. The document body, though heavily obfuscated, suggests a lure related to 'credit titles'. No scripts were extracted, but the PDF structure and link farm heuristic suggest an attempt to drive traffic to malicious sites.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/aws?utm_term=conclusion+sobre+titulos+de+credito PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4428335/normal_6027d150618dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494877/normal_60268feb91f40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366405/normal_602567603bf5e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366035/normal_60062f6ace34d.pdfIn PDF document text
    • https://polovetanofup.weebly.com/uploads/1/3/5/3/135330247/nirilurigivozi.pdfIn PDF document text
    • https://xoxopurotawasuj.weebly.com/uploads/1/3/4/6/134651309/315350.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459468/normal_6023f13ca5a53.pdfIn PDF document text
    • https://rigawegafo.weebly.com/uploads/1/3/4/5/134587157/piwogakazizagudovaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465543/normal_5fdb5fbca6a56.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380536/normal_5fc71b48361cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450148/normal_6019021e97e26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479933/normal_601335e63d489.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fizaxo/lucky_draw_winner_template.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/marvel_avengers_academy_apk_ios.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/11323658338.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/mosomojaj.pdfIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/hearts_of_iron_3_germany_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/76495301036.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/67993198400.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_off0000e7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D0 4768 bytes
SHA-256: e57a60c3568589020906ff1ed98e25da1bc9b8b1b9259adf8d38c8a7b6c66387
font_01_sfnt_off0000f809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF809 11624 bytes
SHA-256: 33540770e184c9adb46288b45a45a935a500bfeb470ed4a5c7933af626d9a1fc

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