Malicious PDF — malware analysis report

Static analysis result for SHA-256 66b568bc08199b5a…

MALICIOUS

PDF

76.4 KB Created: 2021-09-26 13:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 469d014a8a7da15ef2d5b9b16eb37ef6 SHA-1: fbccd2ce5a9f215c1397eccdf8abce30a0416a9d SHA-256: 66b568bc08199b5ac2373fde5e329ebc5fe7ecdb923a446b06d9adce5e4b9ba7
126 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs, many pointing to suspicious domains, suggesting it functions as a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the nature of these links, indicating an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://jecoexports.com/ckfinder/userfiles/files/ninefuxum.pdf In PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210920175924.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cebb6e682f---basibi.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/senalozibinuxa.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/vovejetokeza.pdfIn PDF document text
    • https://hanoihome.net/img_duhoc/files/81033735122.pdfIn PDF document text
    • http://fuchs-orthopaedie.de/UserFiles/file/71497296111.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/folepaverijadafu.pdfIn PDF document text
    • https://tsolisp.com/files/file/tadotexoboxotuvowegimi.pdfIn PDF document text
    • https://parfumzone.ro/files/file/8786738986.pdfIn PDF document text
    • https://flomogroup.com/upload/files/91824519474.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/80935840549.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/samowul.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/kibazegabanasog.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/62969189573.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/80766214765.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/muzoderid.pdfIn PDF document text
    • http://capableapp.com/uploads/files/69740802864.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/18720310111.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/bitezigudafidaruxuxeroro.pdfIn PDF document text
    • http://4darchitecture.org/img/all/lirexexezu.pdfIn PDF document text
    • https://megalight.lv/uploads/files/xenobojosudobomasax.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/zuxevobajoravubagerulox.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/namotonavito.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/84421216150.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=gta+sa+inside+androidPDF link annotation
    • https://rt9.rspo.org/ckfinder/userfiles/files/kelulukeke.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_off0000c353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC353 18928 bytes
SHA-256: 0982b6b6e2eafae3d59a828f1088b11571e2772a17f01492269b75cd665eb040
font_01_sfnt_off0000f4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDD 10236 bytes
SHA-256: 3e90681eff5f81d3ff10fa78b4845c7125adaf6a8b85dad554b26c8bb22bdf4c