Malicious PDF — malware analysis report

Static analysis result for SHA-256 a258472d39f10b77…

MALICIOUS

PDF

68.7 KB Created: 2021-03-03 19:37:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: ea78b8a291bbf1f3dc62ce5d4219ccf4 SHA-1: 9c4e716a8805d132cad101ed8528b16b6aaf02de SHA-256: a258472d39f10b77e8db366432bd8ad9e60ad8e88aa500a216a90eb3e56d584e
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://golowaki.ru/award?keyword=cissp+7th+edition+shon+harris+pdf PDF link annotation
    • http://tenumuxuw.iblogger.org/adobe_photoshop_7._0_setup._dll.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407781/normal_5fe18ba367a28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481985/normal_6011202a42b1b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455403/normal_5fdfce6a89b45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417806/normal_60344fdf14e0f.pdfIn PDF document text
    • https://pemugaladesav.weebly.com/uploads/1/3/5/3/135307247/majelek.pdfIn PDF document text
    • https://cdn.sqhk.co/xadeviro/kjgtF2r/68629355427.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445754/normal_5ff5cb0468f1c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387826/normal_5fcc37704ffc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459057/normal_5fd8eb5b86f22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412757/normal_600b980b7e9aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493201/normal_601f9b3325f4c.pdfIn PDF document text
    • http://fikodon.iblogger.org/any_video_recorder_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/benanejufa/Y6xAXhd/63732157134.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://govujetimavex.epizy.com/blue_card_application_form_july_2019.pdfIn PDF document text
    • http://kosizesifona.epizy.com/89464328666.pdfIn PDF document text
    • http://sawexelisam.epizy.com/procreate_tutorial_portrait.pdfIn PDF document text
    • http://xogimutidum.epizy.com/77929304067.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_off0000cfa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA2 5080 bytes
SHA-256: 669b8da0db301df9f3b91543060441247e966a285d464358924225d1ad192fc2
font_01_sfnt_off0000e0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E5 10700 bytes
SHA-256: 1a9b2b0bb38b2c1a1346837979f048d535507a97a7842c8427d8c5efe24e3f24