Malicious PDF — malware analysis report

Static analysis result for SHA-256 8916fea3548d172b…

MALICIOUS

PDF

82.6 KB Created: 2021-01-12 15:48:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 836fe47ca9ea1554b84c8d89e9b2c474 SHA-1: 525b671102906ecd04e1e0a0a4bcfc74c48fdca7 SHA-256: 8916fea3548d172b26a34b4f62005303d03a0c5945e7f7d23877da4d505c3200
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a high-severity heuristic firing indicating an image lure linked to an SEO redirector, identified as a free-download phishing attempt. The ML classifier and ClamAV detection strongly support a malicious classification. The embedded URL, https://trafffe.ru/aws?utm_term=byos+starbound+guide, is the primary indicator of compromise, likely leading to a phishing or malware distribution site.

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://trafffe.ru/aws?utm_term=byos+starbound+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383308/normal_5fa387b7d4d14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386334/normal_5f8fc83c6c59a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477155/normal_5ff433e0c93e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470523/normal_5fc8fc21d25ef.pdfIn PDF document text
    • https://site-1176587.mozfiles.com/files/1176587/chiller_york_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423442/normal_5fceb006ad5fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451047/normal_5faf92c6f40d6.pdfIn PDF document text
    • https://site-1176376.mozfiles.com/files/1176376/best_adventure_motorcycle_tires.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/nitizobuv/27364142522.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/tamil_movies_hd_mp4_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/2107111375.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/c_user-_defined_deduction_guides.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10688 5252 bytes
SHA-256: a681aa0f3eea6ac9e81a7c9133fbd79a21eaed6b359ab75bf5bb183139d0e3c6
font_01_sfnt_off0001187d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187D 11060 bytes
SHA-256: 55c8161f270bd7b6f15785224f62d738da77b3f6075eaa7f9cb34982dc453ace

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