Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1415dce6edfe623…

MALICIOUS

PDF

138.4 KB Created: 2021-04-08 02:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c676d0d0e862e677a4cadc131c3e39ac SHA-1: 792ff8e542ab32a30d8a87604e9731399b6385ce SHA-256: e1415dce6edfe62380d112cb45f4129a233ef4a1bc86eb882ba37494bbe84f11
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded links that point to a known malicious redirector, identified by multiple heuristics and ClamAV. The redirector URL is designed to lure users into clicking, likely as part of a phishing campaign or to download a secondary payload. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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/strik?utm_term=navistar+dt466e+specs In PDF document text
    • https://static.s123-cdn-static.com/uploads/4375694/normal_5fe39112c6157.pdfIn PDF document text
    • https://tosopolugo.weebly.com/uploads/1/3/4/4/134440872/pumakulawi_tatixekivepi.pdfIn PDF document text
    • https://gumewutudeg.weebly.com/uploads/1/3/0/8/130813982/f522b.pdfIn PDF document text
    • http://sosogemizibu.mypressonline.com/35206428713.pdfIn PDF document text
    • http://movizopolu.medianewsonline.com/34530537728.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416301/normal_602a18b7940d1.pdfIn PDF document text
    • http://kakolamilasaru.medianewsonline.com/anaplasma_platys.pdfIn PDF document text
    • http://sokepazetovul.22web.org/bayesian_statistical_modeling_congdon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd921e81-6c78-4b11-aea6-518fdc5c94f0/munogudinisonapivimamex.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/irregular_verbs_list_spanish.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/betternet_vpn_free_for_pc.pdfIn PDF document text
    • http://kabewusibun.epizy.com/the_best_free_gps_navigation_app_for_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/what_does_multivariate_mean_in_statistics.pdfIn PDF document text
    • http://lawesiwewif.onlinewebshop.net/44167667737.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/61698039185.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca787d10-a9e5-47a3-964e-a1467649a470/mr_coffee_maker_4_cup_bed_bath_beyond.pdfIn PDF document text
    • http://vilepobafomunow.atwebpages.com/2d_and_3d_shapes_worksheets_for_grade_1.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_off0001e0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E0C3 5304 bytes
SHA-256: 6defa5689c9aecde7779afa2383effd3bc58598ada0c30d52a45eb287992a178
font_01_sfnt_off0001f2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F2F3 12360 bytes
SHA-256: 1a7e4739454dfa76c7fbee2b8c6832334207b9d1df7ca104b846e9077c031e1b

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