Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e40cc6a1dceb1b9…

MALICIOUS

PDF

69.0 KB Created: 2021-09-25 19:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 926e06c01f70b827534eed59b4c804b6 SHA-1: 34ca4b725be3de903b97a19875b7e2abaabf6712 SHA-256: 5e40cc6a1dceb1b96edba1e008409e648a2a5dc50cdde795c9b01baec481a742
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to disposable hosting, likely to obscure the ultimate destination. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://kyochonbuenapark.iorderfoods.com/uploads/files/sugupibawodazimix.pdf In PDF document text
    • http://itemclinicchina.com/ckupload/files/17875622455.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/42468293725.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/88949888348.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/mitazudiwasobufitaberobi.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/66656536978.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/40893203885.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/xetobezuripuf.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137823fed098---tutabolomoresafopavib.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130f897e2c9d---limunevalofebu.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/varumusidebem.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/97680422901.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/94345345319.pdfIn PDF document text
    • https://advantage.ee/media/contents/file/zunogadizuvi.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/guxosuvutipuf.pdfIn PDF document text
    • http://prograsifkalip.com/files/59529529306.pdfIn PDF document text
    • http://pk.mo/userfiles/file/kagosezefojasosewele.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/56780745649.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/kofopo.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/76091930715.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210910120430.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/63647352277.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/wifesomorozose.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/monudazux.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/befigudip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=jeepers+creepers+1+watch+onlinePDF link annotation
    • 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_off0000b007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB007 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81E 10600 bytes
SHA-256: 40767153bf9dc662038c77ad13ea9c49cbade3fbbbfa43731e49651a8f43cf45
font_02_sfnt_off0000e065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE065 15028 bytes
SHA-256: 577f074096b6796683e8f138be3518d83a9f5e4ef976b13fe80d90ecb05f58ac