Malicious PDF — malware analysis report

Static analysis result for SHA-256 620b14a52223f49f…

MALICIOUS

PDF

83.9 KB Created: 2021-09-19 00:20:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 67a523e86e5e1983353412b350bab366 SHA-1: 833f1c9c82d4ba10c86e1c6d5b189a7d51d31619 SHA-256: 620b14a52223f49fc097e7ecb1629841f1edea6ff19f35b4b289da90eea24a29
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the presence of numerous unknown URLs suggest the document is designed to redirect users to potentially harmful websites. The embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/913980de4148f096e0f34b3201e9fb81/4837306388.pdf In PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/3285805300.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/46300489853.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/9138409012.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/64445621510.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/luxuxuleperusigafoz.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/84219525227.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161396db53353d---sojuxejovi.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/69513426800.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/58134171781.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/17276304374.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/71749733063.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/dotevamodijererodo.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/pumosanesawomixili.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/48223621862.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/91538439464.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/fewigo.pdfIn PDF document text
    • http://leguido.net/files/fukuzaxogekasejixebepi.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/69302592165.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/lolozagovufenusu.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/tujebiteripekevutog.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/wasexasifisapakezeze.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/6586426135.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=apk+emulator+for+pc+windows+7PDF 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_off0000e589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE589 11088 bytes
SHA-256: 663b8b932c7e1b8ce98c0c5d32b593dcb68b88cbe62cfce1f24367abe186ca57
font_01_sfnt_off0000ff85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11797 16328 bytes
SHA-256: 4190962ceb4c3f6f67a82463bd06655383b8369bd86b355486099c49b9c08059