Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca53cbd56b76283…

MALICIOUS

PDF

69.4 KB Created: 2021-03-05 12:56:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 389f12b30c90b2bcc674d5558d5aa327 SHA-1: 36cebabb9c62e7c33238a3e41a4e0c458eff540d SHA-256: aca53cbd56b762831cc41974994fc950dd17f00ee11d8cca9bcb00f614949574
196 Risk Score

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://vilenefex.ru/award?keyword=how+to+convert+13.6+g%252Fcm%255E3+into+kg%252Fm%255E3 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4416659/normal_600271c1650d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367667/normal_5fd2e27537cb3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371523/normal_5fcea4efaea14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409798/normal_5fda7562abace.pdfIn PDF document text
    • https://noragunefide.weebly.com/uploads/1/3/1/6/131637841/dexujagebatatuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390383/normal_6004a5fb0764a.pdfIn PDF document text
    • http://nemugub.mywebcommunity.org/48046788150.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367005/normal_60196388b604f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459794/normal_5fed90ade118e.pdfIn PDF document text
    • https://bidumijedurazi.weebly.com/uploads/1/3/1/4/131437194/4219411.pdfIn PDF document text
    • http://fetiweresanamud.iblogger.org/will_would_exercises_with_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_a8300529c556445e8aaa9985669c637c.pdf?index=trueIn PDF document text
    • http://kogisovaf.epizy.com/cognex_checker_software_manual.pdfIn PDF document text
    • https://ca6b24e6-01cd-4368-a310-1df05077a315.filesusr.com/ugd/11b39a_3bd5a9bb15f844ce80a81d8c795de5e1.pdf?index=trueIn PDF document text
    • http://wavusuwu.epizy.com/lanuzotidex.pdfIn PDF document text
    • https://45180a89-8b92-4d54-a4c6-cdf0ad6af3c7.filesusr.com/ugd/2b98a3_62eae5fc7a3441f6a17911568e8db067.pdf?index=trueIn PDF document text
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_5680f10abbc249e0ab2662680e5eb4c0.pdf?index=trueIn PDF document text
    • http://bavatesivo.myartsonline.com/mofowuzosijuza.pdfIn PDF document text
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_ba464d1b3f654916bcda05256d5ed5ce.pdf?index=trueIn 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_off0000d1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D1 5364 bytes
SHA-256: 2f27aa8a0df17ecc2230b08e0acfa2e780be5a5045df567243f917dfa19f6733
font_01_sfnt_off0000e43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43E 10520 bytes
SHA-256: c79267b7b6869cce16dafae8433a5b83208325ea400d26bed0f174f62dcdef96