Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7152ab194aded56…

MALICIOUS

PDF

72.2 KB Created: 2021-09-16 17:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a82f4e499c1e646dc4cf7fe146523a44 SHA-1: 092a754560abdcfa22624b8a3374a77f9af9e24f SHA-256: a7152ab194aded5632adad04ef99497c70f81d7a3b9972fc116ac9aa297e48d0
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a malformed exploit stream. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and exploit indicators point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/57950835290.pdf In PDF document text
    • http://dsraxys.com/uploads/faxinurajabaparenunuko.pdfIn PDF document text
    • http://babamoleskine.com/files/file/kapibobimasukabazanaval.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/55209487448.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/vodorafovapugizuguxute.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/xudipak.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/repuwexo.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/xakubuk.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139427a6b668---49044428587.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/81021262041.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/wojetoribovogusuxop.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///49449019282.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/4736625631.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/83928974922.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/71567661531.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210909200230177.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/90405307927.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/dolideluvomeviz.pdfIn PDF document text
    • https://irantruck.ir/data/file/33495000466.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a5c6eb268---60409547822.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/95310796564.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=the+easiest+song+to+play+on+ukulelePDF 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_off0000b767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB767 10700 bytes
SHA-256: 37c80ad33af15911c5012bed5653d3d963ab6a96d2cd62b0b185f3f748476e29
font_01_sfnt_off0000cff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF9 16848 bytes
SHA-256: 8565740d6eb1f6f4998c116c8066d4d0df759e747f5fbc3ba3e88753433bf932
font_02_sfnt_off0000fb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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