Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb871a603dc8cb68…

MALICIOUS

PDF

78.8 KB Created: 2021-03-23 17:35:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 44765c871072663dedecd01077909b8a SHA-1: ced5925e1228ffba239da2e85d15d92ca28f49bf SHA-256: cb871a603dc8cb688c5fdff64a69a57c8cf45c9ebc2ed343d0428ae49d9f8bf4
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, specifically as a phishing trojan. It employs a lure related to sheet music to entice users, with a high-confidence heuristic indicating it's an image lure linking to an SEO redirector. The primary IOC is the redirector URL, which likely leads to the final malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://golowaki.ru/123?utm_term=alto+saxophone+solos+sheet+music PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4444117/normal_60506441be627.pdfIn PDF document text
    • https://maritomumotoko.weebly.com/uploads/1/3/4/5/134512683/bubiwarosu-birurisekiwopo-gebirigu.pdfIn PDF document text
    • https://jotabejomunumog.weebly.com/uploads/1/3/0/8/130813846/xupek.pdfIn PDF document text
    • https://noremovex.weebly.com/uploads/1/3/4/8/134883944/pepipaf.pdfIn PDF document text
    • https://ritukananikunid.weebly.com/uploads/1/3/0/9/130969552/nimesasi-tuxaf-zorufawi.pdfIn PDF document text
    • https://muxalogedidu.weebly.com/uploads/1/3/4/3/134358485/3762263.pdfIn PDF document text
    • https://cdn.sqhk.co/kafekogi/ggeOozR/53384253350.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonaxadu/RzVXhgF/35755719353.pdfIn PDF document text
    • http://golivexi.22web.org/textbook_of_medicinal_chemistry_by_ilango_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475737/normal_5fdbafbb5199a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382197/normal_5fe394f736f39.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/nazekisigiduz/a_court_of_thorns_and_roses_duck.pdfIn PDF document text
    • http://jagutebi.epizy.com/jowowutijenazugezo.pdfIn PDF document text
    • http://zukuvib.rf.gd/is_the_fujitsu_scansnap_s1500_wireless.pdfIn PDF document text
    • http://zagopemolal.rf.gd/shell_script_linux_tutorial.pdfIn PDF document text
    • http://kofupugixujodin.epizy.com/follow_up_email_template_for_job.pdfIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/bass_guitar_how_to_read_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/10994167822.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/47784569603.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/11428389762.pdfIn PDF document text
    • http://polotukumi.rf.gd/amazing_science_facts_with_pictures.pdfIn PDF document text
    • http://jovagerebof.rf.gd/mikuvetogufesorawowuti.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CE 3888 bytes
SHA-256: 82b36438ccf5acdf2e9fb589806667a897f74b06233e79939a36d0023b667d47
font_01_sfnt_off0000f49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49D 5136 bytes
SHA-256: d68acfa1a5c1f73a06d6827ac45134b7e576453c2a6978b62006d6504ef20c29
font_02_sfnt_off000105f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F8 11540 bytes
SHA-256: 5b960c8c10afdae18e41e8e09c9d3d68f51a60f5c96bdcafca4ffea4aff81364

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