Malicious PDF — malware analysis report

Static analysis result for SHA-256 c57bba85f13ec320…

MALICIOUS

PDF

77.5 KB Created: 2021-02-02 10:40:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 254d741132f076007f04e685b9a08cef SHA-1: 4f67d9c3dcd4fe5d7f3f0909641edd22084a48c2 SHA-256: c57bba85f13ec3200b8d0f8a6d9277afae7c8329c91d75af043b314f6b1bfb3d
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, indicating it's a phishing or trojan delivery mechanism. It contains a large number of external links, many of which appear to be part of an SEO link farm designed to redirect users to malicious content, specifically disguised as a "Daily mail tv guide". The primary URL used for redirection is https://jottigo.ru/aws?utm_term=daily+mail+tv+guide, which likely serves as a gateway to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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=daily+mail+tv+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382781/normal_5fe9f3b554dcd.pdfIn PDF document text
    • https://mulolixebewiw.weebly.com/uploads/1/3/1/3/131383386/21bde985455a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463809/normal_600b385073390.pdfIn PDF document text
    • https://cdn.sqhk.co/bavomizobe/2bVic9g/microsoft_word_crossword_puzzle_answers.pdfIn PDF document text
    • https://sudopefizumizer.weebly.com/uploads/1/3/1/3/131383323/3345109.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459792/normal_5fe81bcbc9c53.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486745/normal_5fe5eda9bd3de.pdfIn PDF document text
    • https://cdn.sqhk.co/boguzivipel/gf6N5hg/81038672676.pdfIn PDF document text
    • https://cdn.sqhk.co/japokaxe/6Pgdhe0/teppanyaki_buffet_fredericksburg_va.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422643/normal_5fceda4b23085.pdfIn PDF document text
    • https://cdn.sqhk.co/pidodalatip/mjbU3cc/linetoveririlaxuvemilot.pdfIn PDF document text
    • https://xadonuxezi.weebly.com/uploads/1/3/4/1/134131919/406753.pdfIn PDF document text
    • https://cdn.sqhk.co/kuvapipitol/m1hbWhj/64978079256.pdfIn PDF document text
    • https://cdn.sqhk.co/verexumifo/id7KTdE/farafavesos.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/jgiicvj/10010936661.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381971/normal_5ffdff336466b.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_off0000f2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A4 5032 bytes
SHA-256: a94334305bb872028ec1f65ee7c2e34bb4329856eaff3725c8a5212c5192098c
font_01_sfnt_off000103ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CA 10936 bytes
SHA-256: 736e2d81854d4895f2d8698116acd4cc6793ad85f14b29533b3fc0a76babc5a3

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