Malicious PDF — malware analysis report

Static analysis result for SHA-256 edeec3638e3ac42c…

MALICIOUS

PDF

81.2 KB Created: 2021-09-18 03:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7fdb8dfef8400d48a1d7e92139c57ea5 SHA-1: 9da4e6eed8d83c69e61213e5ecb16f4fb55a3af6 SHA-256: edeec3638e3ac42cdb47156810616623debcbe540b65b0cf80f0c77ddcfed9bd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm with numerous external URIs pointing to disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://krisoc.ru/uplcv?utm_term=apk+stickman+dismounting PDF link annotation
    • https://96662888.com/editor_upload/file/49815236781.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/25505692242.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/lolukosatudedez.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/61053495157.pdfIn PDF document text
    • http://stringladies.cz/userfiles/28822802228.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/sobivum.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614031b2829f6---89930871451.pdfIn PDF document text
    • http://centronegozi.com/public/21115847298.pdfIn PDF document text
    • http://polishedskincare.com/minaret/uploads/file/pojipisilefalulazis.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/81478556540.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614515a5091e2---71331613218.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/xiloladisevuw.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/21204958976133bba6b50a0.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/nudiravavafesifimefesi.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/52727818484.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/72213704089.pdfIn PDF document text
    • http://bulmarconsult.com/files/lepawod.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/vurixa.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210908124811_0hm26a.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/95216025382.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/raligedajak.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/geremani.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BC 10752 bytes
SHA-256: 37e3e4e6345f66c289e76194d12ccf55ae6a580e7a34d4ea12a48065fedab1df
font_02_sfnt_off00010b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B50 16836 bytes
SHA-256: 07d845d0f637299a1ad2b025f88df6cc07fb1f3ad6786145f078eb4b3faada02

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