Malicious PDF — malware analysis report

Static analysis result for SHA-256 8469526cab8cb79e…

MALICIOUS

PDF

71.7 KB Created: 2021-04-06 07:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4459b82a9e2b08803711fdce83fbbd70 SHA-1: c752bcf05e1db8f9de7799fba78dd39fd626d042 SHA-256: 8469526cab8cb79ef97d00e240a2708bbf008a29600d804e3236c523446cb8b6
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which point to SEO-optimized PDF files, suggesting a link farm designed to attract users searching for specific content. The primary URL, 'https://gimoguvi.ru/award?keyword=rodas+da+vida+anodea+judith+pdf', is identified as a lure for free downloads, a common phishing tactic. ClamAV detection and ML classification confirm the malicious nature of the file, likely serving as a phishing document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://gimoguvi.ru/award?keyword=rodas+da+vida+anodea+judith+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4494648/normal_5fc5b46bef5a4.pdfIn PDF document text
    • https://sesanejaw.weebly.com/uploads/1/3/1/4/131407178/nuzedibike.pdfIn PDF document text
    • http://idealicaitalia-ufficiale.site/how_to_make_a_moist_7up_cakecrprd.pdfIn PDF document text
    • https://demaxezobenila.weebly.com/uploads/1/3/1/8/131856353/giruleki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475217/normal_60163c1e8ff31.pdfIn PDF document text
    • https://mafoxoluz.weebly.com/uploads/1/3/1/4/131483222/f9e62724.pdfIn PDF document text
    • http://keto-s1.com/toyota_red_tag_event_ottawartbir.pdfIn PDF document text
    • http://fullstacket.online/10677664352eos6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450039/normal_6068ef86ad542.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472206/normal_6052a8cbf0750.pdfIn PDF document text
    • https://nifirasevaxo.weebly.com/uploads/1/3/4/7/134756957/792696.pdfIn PDF document text
    • http://imedo.ru/best_scorer_serie_a_2020jr86w.pdfIn PDF document text
    • https://sutivekawexebe.weebly.com/uploads/1/3/1/6/131636655/8854566.pdfIn PDF document text
    • http://prizinsta24.space/how_to_use_birdseye_on_garminy87l6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380405/normal_5ffb1d7c35cdc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369665/normal_5fdd0151c60cd.pdfIn PDF document text
    • http://tiwegopoguxuzu.mypressonline.com/kukoluwenagikafufu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493881/normal_5ff0c730a4011.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368227/normal_5ff37db36af1c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385436/normal_5fe45a7f5712e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://59cf682b-6680-4a08-8b8d-0472bab64ef7.filesusr.com/ugd/d7d6cd_ff33134cac304c5d91747d5b7fa00a86.pdf?index=trueIn PDF document text
    • https://bf130ee1-1463-4c69-9604-1b23772ced92.filesusr.com/ugd/b4609a_856a365823bd404fbdb8c5cffa242f38.pdf?index=trueIn PDF document text
    • https://3789e5f8-265e-48cd-8836-241a044b7ceb.filesusr.com/ugd/45ef7e_fb0133b4409347918f46f4c629aebf30.pdf?index=trueIn PDF document text
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_0bdf43ec77e3411f956480c218ef326d.pdf?index=trueIn PDF document text
    • https://1f49b3f1-4b09-4f89-88df-03804352fc9a.filesusr.com/ugd/a51aec_19ab07137ee94fc9a4b53b697f0d6025.pdf?index=trueIn PDF document text
    • http://kepawomokatuke.myartsonline.com/reliability_centered_maintenance_by_john_moubray.pdfIn PDF document text
    • http://wegugoleta.onlinewebshop.net/markstrat_vodite_strategy.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78F 5144 bytes
SHA-256: 95148947ae645a5a0cd3a1c80be8e03b46920e6c65a8ec7f7f07fc2af1a14e83
font_01_sfnt_off0000e927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE927 12808 bytes
SHA-256: 5de8625395f7cd4350f284a3eba0f541cbe057f1620562024be261c52f4b007c

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