Malicious PDF — malware analysis report

Static analysis result for SHA-256 3736b73f693118ab…

MALICIOUS

PDF

75.2 KB Created: 2021-02-19 04:40:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 8a8cf9c5565a677e28dc04bb0ebf417d SHA-1: 2b51b0480a2c0449182353420b6d1aa61ad1103c SHA-256: 3736b73f693118ab25dd7fb725b48663b560a28db85771ba869ec1ef2def315a
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_UTM_REDIRECTOR_LINK' heuristics. The ML classifier also strongly indicated maliciousness. The primary lure appears to be related to 'easy piano songs sheet music free', suggesting a phishing or scam attempt to redirect users to 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
  • 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=easy+piano+songs+sheet+music+free In PDF document text
    • https://cdn-cms.f-static.net/uploads/4386094/normal_5fe90a2c9dbbf.pdfIn PDF document text
    • http://roman-holidays.shop/ryobi_ss26_weed_eater_air_filterp3ksx.pdfIn PDF document text
    • http://damvglaz6.xyz/13347793436uc7c6.pdfIn PDF document text
    • http://istlan.fun/alone_again_partition_piano7jenr.pdfIn PDF document text
    • http://sunuxew.22web.org/crone_corkill_temp_timesheet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389106/normal_5fce2e6fd89da.pdfIn PDF document text
    • http://duplicwcnj.space/mills_eagles_red_carm3vhq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445570/normal_6015dd8c4f58a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410216/normal_5ff7c485349d1.pdfIn PDF document text
    • http://fesumebujurasa.22web.org/in_christ_alone_lutheran_hymnal.pdfIn PDF document text
    • http://ladukusuga.22web.org/39111879733.pdfIn PDF document text
    • http://tejifepubodol.iblogger.org/small_water_pimple_in_mouth.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473642/normal_601ce02216aa4.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/taguxif/84840208738.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/fefatodowaborukedugozogo.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/72180250294.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/10781228926.pdfIn PDF document text
    • http://lojanapijavavo.rf.gd/blitzkrieg_tactics.pdfIn PDF document text
    • http://nigabosepa.epizy.com/negotiable_instruments_act_1981_in_hindi.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_off0000e7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D8 5456 bytes
SHA-256: 5dcd73ce887b03ee6f3f17d539412bd3b0a46cce7a513914c93ba016c63f53fe
font_01_sfnt_off0000fa50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA50 10860 bytes
SHA-256: 9a9eca6a62794f08560d02f00a947eb59714be8baff89b311b8ede951c11139d

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