Malicious PDF — malware analysis report

Static analysis result for SHA-256 31fdd7584afe9563…

MALICIOUS

PDF

85.9 KB Created: 2021-02-19 17:45:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: cbc04a985e85e247b740c13091de8fbd SHA-1: 1631731004c00b071c4000eb07570477cf8d2f2d SHA-256: 31fdd7584afe95636cd4ba4d328aab0a8b32fe5c524d7a90264e123913e06e15
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 a heuristic indicating it is a phishing lure, redirecting users to a suspicious URL. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded URL is likely part of a phishing campaign designed to trick users into visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/123?utm_term=what+happens+at+a+poetry+slam PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4421770/normal_6002a733291c2.pdfIn PDF document text
    • https://cdn.sqhk.co/fatidizeru/iciJsja/jusidisefagixagasomuvug.pdfIn PDF document text
    • https://cdn.sqhk.co/nepofigiper/jgghjjK/rally_racer_dirt_apk_hile.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459624/normal_5fe59cbd09f7a.pdfIn PDF document text
    • https://cdn.sqhk.co/rogenujudita/hjbOigh/define_value_in_elements_of_design.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tapexiw/formal_letter_to_state_senator.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/tezasomi.pdfIn PDF document text
    • http://sufumawug.epizy.com/domijijaxegodemuzanogiz.pdfIn PDF document text
    • http://pebulibupa.rf.gd/vaxodupigobebuzomox.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/78646041920.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/mufafunusafixul.pdfIn PDF document text
    • http://nabafurulevu.epizy.com/verutinisizivinifo.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/video_recorder_free_for_windows_8.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 8

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_off00011315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11315 5176 bytes
SHA-256: 4ab32e828ade791ed26458091c2e8451d41f89c2b11490df7bcc81f21cc282dc
font_01_sfnt_off00012494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12494 11728 bytes
SHA-256: 9b353d232b9c8e7aec18a040aa7548cee204be720ee6d0f98f22e3fda54be5ef

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