Malicious PDF — malware analysis report

Static analysis result for SHA-256 3284ace916fe4475…

MALICIOUS

PDF

220.2 KB Created: 2021-03-17 22:55:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 4b344781b6a4d8a73850e0caa6dbc895 SHA-1: d107da272eaa4a902fb7813b45db015d6d6568f8 SHA-256: 3284ace916fe4475522bf9d43792cbe091972d04d6970b53e433afd5f3d4c9e7
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains an embedded URI that redirects to a suspicious domain, identified as a lure for phishing or malware distribution. The presence of an external URI and the nature of the detection suggest an attempt to trick the user into visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9823

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://maypoin.ru/wix?keyword=%25E6%2583%258A%25E5%25A5%2587%25E9%2598%259F%25E9%2595%25BF+%25E5%259C%25A8%25E7%25BA%25BF+%25E6%25B5%25B7%25E5%2585%2594 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390330/normal_604d63e244d95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413242/normal_6021295799dda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416802/normal_6005a124294fe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387815/normal_5ff209835ce56.pdfIn PDF document text
    • http://wisecredit.info/how_to_stiffen_a_hat_brimuy6ka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458614/normal_6046d81a17158.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446170/normal_5fcdfe5572b0b.pdfIn PDF document text
    • http://gazzsheff.xyz/the_second_coming_of_avarice22l3v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455684/normal_603f2f58d1dde.pdfIn PDF document text
    • http://jokojujut.medianewsonline.com/agresti_and_finlay_4th_edition.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_a4921cab7efb43d9a819228310f5a10f.pdf?index=trueIn PDF document text
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_05dfe18451b24d65ab37c76e4a577821.pdf?index=trueIn PDF document text
    • https://28a90398-13b1-4b58-b54c-ed045a6bddf2.filesusr.com/ugd/7e9e1f_17097b89c1b341f983a0c10ca2ff5bfd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4415c736-8f62-4a30-bd8e-3d6c7601b97d/how_to_scan_documents_on_hp_deskjet_f4580.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c447773d-7775-4b53-ad4d-097183f742a1/are_mini_refrigerators_safe.pdfIn PDF document text
    • http://likutolejit.onlinewebshop.net/jegogiruk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87fdcf99-1f5b-422e-aa93-b681089ef3b8/99969366985.pdfIn PDF document text
    • http://kugukokoner.myartsonline.com/accu-chek_compact_plus_kit.pdfIn PDF document text
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_e2dfebc7b9e14bc88b7cc7395c569886.pdf?index=trueIn PDF document text
    • https://a7563df4-ba19-4d82-a8a0-b2470d957038.filesusr.com/ugd/61f964_d3a96fb75921416e809be577efa568b4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/42ccf71e-10d8-4de3-99da-bbe49d286f9d/merit_badge_pamphlets.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3E 181816 bytes
SHA-256: 4190c3111a0837f1943898f30be72ea4b680527060583835cbc40248030c1028
font_01_sfnt_off00030033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30033 5268 bytes
SHA-256: ad7df706a81f4a272dc858dd35ffd09ed84d9ac816f9e8bbf3640d6cc9ec05fb
font_02_sfnt_off0003127c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3127C 4068 bytes
SHA-256: 60a2d6429503f7a4ddaf98851b2b9757a5da54dd45bab0a2aed837b7042708be
font_03_sfnt_off0003205c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3205C 11696 bytes
SHA-256: 6ccf22113b9d50649232ade9afcaf89305cc4d320afd7c4f0283e74a41813e2a
font_04_sfnt_off000348c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x348C6 16676 bytes
SHA-256: 952a05e636fb014b651e31723277883462466132ee2406b8050f0501beb72700

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