Malicious PDF — malware analysis report

Static analysis result for SHA-256 4257ec3d4f813429…

MALICIOUS

PDF

73.1 KB Created: 2021-02-16 16:39:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: c9643b594d99ef4e144629cd71af855e SHA-1: aa3cede0b5394a45746cc982fb118278d789350c SHA-256: 4257ec3d4f81342975cfda2c84c3f642cb8e7fbf7654376bba6d5714bd55d347
254 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=bo3+reaper+skins In PDF document text
    • https://cdn-cms.f-static.net/uploads/4454184/normal_6013120f73ea6.pdfIn PDF document text
    • https://cdn.sqhk.co/bubiwalifeda/cM1RPhe/jepemezad.pdfIn PDF document text
    • http://govusosu.iblogger.org/bootloader_unlock_tool_apk.pdfIn PDF document text
    • https://libepuve.weebly.com/uploads/1/3/1/4/131407284/3816210.pdfIn PDF document text
    • https://cdn.sqhk.co/dekaroku/IGje9mo/catch_chocolate_bar_advert.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391909/normal_5ffb32823e484.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367004/normal_601b2d876660a.pdfIn PDF document text
    • https://cdn.sqhk.co/gujuvizaja/nyhjidv/man_shot_himself_bulletproof_vest.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://matufuw.rf.gd/periguf.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/nusenolarafixowabo.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/anomaly_detection_using_machine_learning.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/kujavojumewimuwo.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/zusakulelojenup.pdfIn PDF document text
    • http://semiwexojexudu.epizy.com/segatarilamovivomojemuxuz.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/jekiritujizabisugojazevab.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/stream_processing_with_apache_spark.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/35825158197.pdfIn PDF document text
    • https://s3.amazonaws.com/gimufesajo/26448518630.pdfIn PDF document text
    • http://litufowanukoro.epizy.com/82262095900.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_off0000df97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF97 5060 bytes
SHA-256: 2522292e66d1d4120a4e5faea1bf6ec959bc927d87397c4d54297a3910501295
font_01_sfnt_off0000f0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E0 11716 bytes
SHA-256: 0482e0fac8e48527d157385a7d587cee0ee06ff3c3960cdf12043d0337f10879

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