Malicious PDF — malware analysis report

Static analysis result for SHA-256 06ed60bfa0bf6362…

MALICIOUS

PDF

82.6 KB Created: 2021-10-07 05:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2c6625dfc6deae534d924bd816ffff52 SHA-1: c052d39035eeceeb8779a37302452c35f23bfdc4 SHA-256: 06ed60bfa0bf63622c41dfb3a307b966dabcf31fad66fc8403ca2f43f3c0f842
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to external domains, many of which are structured to appear as document downloads or resource links. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of hosting many links on disposable domains, suggesting a phishing or spam campaign. No scripts were extracted, but the PDF structure and embedded links strongly suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://coretry.ru/uplcv?utm_term=the+abc+clinical+guide+to+herbs+pdf PDF link annotation
    • https://brawlcall.com/ckfinder/userfiles/files/24085930044.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/gigobofilifusug.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210928_7CBC490C99A26066.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/12050548554.pdfIn PDF document text
    • http://www.zdravotechnika.com/ckfinder/userfiles/files/31627489015.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/darujobibomarupug.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/tamepureranimizugigoturig.pdfIn PDF document text
    • https://blgjad.com/upload/files/gazotifife.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/rajosozenudijizo.pdfIn PDF document text
    • https://anaksemut.com/contents/files/16774982186.pdfIn PDF document text
    • http://stringladies.cz/userfiles/sizid.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/3daf5ce8cd0621ba5bf9d3c31c9821d0/gogetuzifigi.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/50389260424.pdfIn PDF document text
    • http://rem-proekt.com/f/file/limonukapazosasa.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/067042c20124ea87e6ce8bf480c3888e/76175756975.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/14502515422.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/2454561098.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/41915215716.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/xomifameru.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/69306541287.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/kujavozaborefo.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_off0000d961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD961 11104 bytes
SHA-256: ee3116317845595e5bff7981735ab92d3e58fdefacf438a817d9bc5ee88a78bc
font_01_sfnt_off0000f2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C6 19044 bytes
SHA-256: c8f61164589e18cc9da43d31ce8869af9c5f1e78e4a6ac2e9f9760d8f30e9097
font_02_sfnt_off000124c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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