Malicious PDF — malware analysis report

Static analysis result for SHA-256 253c79febb6c1cc9…

MALICIOUS

PDF

65.9 KB Created: 2020-11-16 23:47:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8061e13db87597b06906342a2a178555 SHA-1: 97e699366c4ddcff02bebe4cb2d70020a0c25f19 SHA-256: 253c79febb6c1cc951f3c5ea819a363a1336b0e284171bd97959e3b109219796
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains heuristics indicating it is a phishing lure, specifically using an SEO redirector to disguise a malicious download. The embedded URL, 'https://traffnew.ru/123?utm_term=geografia+fisica+y+humana+de+mexico+pdf', is the primary indicator of this malicious intent. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • 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://traffnew.ru/123?utm_term=geografia+fisica+y+humana+de+mexico+pdf PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tetazino/formularz_ceidg-_1_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcd03b73-44d5-4dd7-8bd1-0544e97966e5/editable_calendar_template.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/57334081707.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9006ee5-eae9-45ac-85af-8f21b42f44e9/majobide.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/fisiopatologia_de_la_anemia_ferropenica_en_el_embarazo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d639a6fe-a0e5-44c7-82c3-5e7fb7ba1c2c/57662167498.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/pijafifovepoketidij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/208455af-f371-471f-ab6d-1ae57752a5bc/pdf-xchange_editor_plus_6.0_serial_k.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/70868243551.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

Related samples 4

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0FF 5740 bytes
SHA-256: 3536b5af062ac953bd391190336cea42718af80a81723667b75044e5a258ac41
font_01_sfnt_off0000d478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD478 11264 bytes
SHA-256: 92d4aa9b91043800c1eafd2dbc426160103611eb344b94d70b9dccf7a92e2574

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