Malicious PDF — malware analysis report

Static analysis result for SHA-256 590fa6a381fe4e2c…

MALICIOUS

PDF

69.4 KB Created: 2020-11-24 05:40:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 8023ddf10e000348cc63ca691f4903fb SHA-1: 2572d227bcfcb119a0649a919447ff5764ed69c6 SHA-256: 590fa6a381fe4e2cbb426fec915975385373066758f895c474d15eb851f7b9d5
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a high-severity heuristic indicating it's a lure for SEO redirectors, specifically for phishing via a fake free download. The embedded URL, https://trafffi.ru/123?utm_term=data+mining+for+the+masses+3rd+edition, is the primary indicator of this phishing attempt. While no scripts were extracted, the PDF structure and URL strongly suggest a phishing campaign.

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
  • 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://trafffi.ru/123?utm_term=data+mining+for+the+masses+3rd+edition PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387589/normal_5fa4ba69b89dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380382/normal_5f8c026e15793.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369334/normal_5f89e7cac27c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424692/normal_5f9bcb4365b9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415964/normal_5f9c44553c7e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446259/normal_5f9edcef30370.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404730/normal_5fa2b06139eb6.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/libosokune/sound_effects_for_vines.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/astafx_side_effects.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/articulation_anatomy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81ddeacb-834a-443c-941d-eb0f4516c754/.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64c1f2d2-e76e-4c65-99ad-fac666102e90/sumubadojalereruril.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/15062420821.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB779 5452 bytes
SHA-256: f16fbd05e68569caaccd126a6f97ccf7e2c22feac182ccb8fa37d9fd2522d81d
font_01_sfnt_off0000c9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DF 10624 bytes
SHA-256: dca46050795bb3e6f477f8f8217338d6536709ebd4a036d70bb6d11a2a1e7a7b
font_02_sfnt_off0000ee3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3E 17528 bytes
SHA-256: 0623437a44d146b363c6cda8ca7a9c568385176d20e71714cf9bc9eb09ae7c06

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