Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c7391e29a9fa67…

MALICIOUS

PDF

68.6 KB Created: 2021-02-11 16:20:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: d60385a2c90976aa7e0e2ccd93be92ac SHA-1: c7fef4f6705b57c9e56df74f2f8289465b56c38b SHA-256: a4c7391e29a9fa6756baffa49e6638562c73aa987e2f35ffff116a1c26e18000
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://maypoin.ru/123?utm_term=olivet+community+schools+staff+directory PDF link annotation
    • https://dapapakutuluj.weebly.com/uploads/1/3/1/3/131384169/08662e4.pdfIn PDF document text
    • https://tumokisomagen.weebly.com/uploads/1/3/4/8/134897409/ef326c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476011/normal_601f69be8eaa0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366665/normal_5ffe4ba55ac1b.pdfIn PDF document text
    • https://jugomezaxazodo.weebly.com/uploads/1/3/5/9/135994004/sigafifodagibix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jipokogave.epizy.com/cch_to_sheet_set_trong_cad.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/77723484728.pdfIn PDF document text
    • http://simipibenafar.epizy.com/waxutikuzedesovaw.pdfIn PDF document text
    • http://pusolegulijased.rf.gd/tofekubarunamisunu.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/81455500326.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/41977863593.pdfIn PDF document text
    • https://s3.amazonaws.com/kewuxejikiwe/28104246501.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/53097356899.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/data_binding_android_dependency.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/17591045672.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_off0000ccdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDC 5448 bytes
SHA-256: ef5651209c9d9c4cd31bc2716625ffde20ebf949ee2ed17c2f326daae3931feb
font_01_sfnt_off0000df46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF46 11880 bytes
SHA-256: 33183f99a483fc710526bc3adad63e29ae26e39baa8ba40f62ed58253dd9f565