Malicious PDF — malware analysis report

Static analysis result for SHA-256 4070996582976a56…

MALICIOUS

PDF

71.7 KB Created: 2020-12-08 11:35:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a91d50d3cee8602c9146393b19b938ed SHA-1: 1e4f27b7f10dbaf8e214c43d92cc436f925c55e1 SHA-256: 4070996582976a567885ba40383c2b0097d60254142a593147d968a68ebc2bb8
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous external links, many of which point to SEO-optimized redirectors, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics suggest the document is designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/123?utm_term=practicing+the+presence+of+god+study+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407303/normal_5fc30c9b151cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367007/normal_5fab687da1f64.pdfIn PDF document text
    • https://nurosizakudagag.weebly.com/uploads/1/3/4/6/134699554/950216.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474723/normal_5fcb2afc5b058.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382429/normal_5f92a4d461f7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402953/normal_5fc32810328f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389354/normal_5f8fb0c5838d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470979/normal_5fbee30cac75c.pdfIn PDF document text
    • https://lugesivewamaxiz.weebly.com/uploads/1/3/4/5/134596289/memirezufarugem_wixafidaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf58ea7acac6192ab80205/1606375659297/83383791393.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b872397-2734-4902-ae07-5d3e61337600/the_secret_magic_book_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba402960-b2a8-41a6-b90e-fdc6bd8d60f5/38749201317.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6f486791da6493f678260/t/5fccfec7920f47545b96ad44/1607270087684/tonikuxunufadaf.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 3

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_off0000dc2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2F 5488 bytes
SHA-256: 141e93ebfc65682d053fc56b25089fc04acc7d8543343496d7f2b96c2a283e58
font_01_sfnt_off0000eede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDE 10352 bytes
SHA-256: c2cbfb8414789baa28493afc6f72f3576b892bcd47325797d29d48e8bb5690da

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