Malicious PDF — malware analysis report

Static analysis result for SHA-256 863a953f31dd26e2…

MALICIOUS

PDF

72.2 KB Created: 2021-04-01 15:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: dc3635cad3ae5fb05f16b7287fca3bf8 SHA-1: 2bdeee9be8af37923d42c495f89b448874471e6f SHA-256: 863a953f31dd26e234c02eefb5adcb4dca5e86ff80b99e73cb0a0039dcf71411
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 detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. The heuristic 'PDF_SEO_UTM_REDIRECTOR_LINK' specifically points to a free-download phishing lure. The embedded URL, https://leonvi.ru/aws?utm_term=2007+cub+cadet+lt1050+starter+solenoid, is the primary indicator of compromise, likely leading to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/aws?utm_term=2007+cub+cadet+lt1050+starter+solenoid PDF link annotation
    • http://siruxovilojo.iblogger.org/birsen_yaynevi_yap_statii.pdfIn PDF document text
    • https://cdn.sqhk.co/nomitusibop/hbSEeih/bawasodirifobudoxonur.pdfIn PDF document text
    • http://wojazilasifef.iblogger.org/basics_of_networking_tutorial.pdfIn PDF document text
    • http://tokigarodam.22web.org/trane_xe90_reset.pdfIn PDF document text
    • http://vurujupafowutox.mypressonline.com/ruzod.pdfIn PDF document text
    • http://wivaserana.mywebcommunity.org/vobujetumowenazewakewabuw.pdfIn PDF document text
    • http://farotosinotom.mywebcommunity.org/reducing_carbon_footprint.pdfIn PDF document text
    • http://vejobazure.22web.org/wedding_day_wishes_video_free.pdfIn PDF document text
    • http://dafesoxexigu.medianewsonline.com/l_accouchement_dystocique.pdfIn PDF document text
    • http://dijawobal.iblogger.org/ryobi_band_saw_guide.pdfIn PDF document text
    • http://dezowem.medianewsonline.com/analyse_de_la_boite_a_merveille_chapitre_par_chapitre.pdfIn PDF document text
    • https://cdn.sqhk.co/zejejofe/bShjNjh/unicorn_photography_brini.pdfIn PDF document text
    • http://jelexak.iblogger.org/38103328769.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/2a89544b-f310-4f83-a9dd-6135d4860864/ap_english_literature_and_composition_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/answering_service_jobs_from_home_houston_tx.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/76276966482.pdfIn PDF document text
    • http://belunovozexuse.rf.gd/87402225775.pdfIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/putowemak.pdfIn PDF document text
    • http://siparedobapu.rf.gd/square_root_worksheet_for_grade_8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c256c08-d18f-4bc1-8a04-fd6ca81bda4e/how_to_explain_completing_the_square.pdfIn PDF document text
    • http://jamurujitexezi.epizy.com/sadufemewelejekedobemotej.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/amazon_uk_email_address_format.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_off0000db01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB01 5508 bytes
SHA-256: 52e67d72f897ddec94fdc51ba3d47309e2d31c7920e2fe39b4155c490d1b714f
font_01_sfnt_off0000edcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCD 11180 bytes
SHA-256: 16ee7ae2cc6ac18145546aaa757c2f8493b8d1c7194b9625de4cc1f772c0ca61

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