Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f57209f83bbb91…

MALICIOUS

PDF

49.6 KB Created: 2020-08-19 05:41:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: d759172d3754ca5968417c8f236f59c3 SHA-1: 7765a3ac1fdfdf0a7481e040c65bb20ce49f0455 SHA-256: 82f57209f83bbb91a33d1e7deeaa26ad00de63662ac4bc91b5c7e4827403289b
194 Risk Score

Malware Insights

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

The PDF contains numerous links designed to create a link farm, with a primary redirector pointing to a malicious URL. The document body, though heavily obfuscated, contains the string 'Antivirus for computer' and the malicious URL, suggesting a phishing lure for fake antivirus software. The presence of embedded URLs and the ML classifier's high confidence further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ttraff.ru/pify?keyword=antivirus+for+computer In PDF document text
    • http://files.jamesonbrown.com/uploads/1/3/2/3/132303245/bepexirarenaw-kugadot-kusuwife.pdfIn PDF document text
    • http://files.bestecomerce.com/uploads/1/3/0/8/130814636/mozinuvalebumoxuduka.pdfIn PDF document text
    • http://jusafe.beastbeats.net/uploads/1/3/1/3/131397971/nizidof_buduve_sifop.pdfIn PDF document text
    • http://xamazewa.sealsnetball.com/uploads/1/3/1/3/131398222/172034.pdfIn PDF document text
    • http://files.hunterdonchurch.org/uploads/1/3/0/7/130775701/jukonovedobikox_wufobilezow_bogekulanijife.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2647/2345/files/nufosotilixirexar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0450/8686/7621/files/5955951442.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6732/6110/files/48345510869.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1452/6872/files/60887312078.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6113/2968/files/57924674741.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0378/9991/files/booster_seat_guidelines_michigan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2462/9411/files/14238588865.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/kupasopijin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6381/1997/files/xuxokegokumuwon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6674/4216/files/vafikagipelaxotigodal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8688/9625/files/25912084699.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6481/1935/files/13887795226.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_off000085b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85B3 4968 bytes
SHA-256: 36b1586ff115b36232583507ab93c85da70f2977cae996af927135f129c5f69b
font_01_sfnt_off00009690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9690 10272 bytes
SHA-256: 23385cb1cfb4e16faec658032b79063866d302d2e04791ca263add68a8fdcd43

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