Malicious PDF — malware analysis report

Static analysis result for SHA-256 84b22fe9604e46e0…

MALICIOUS

PDF

81.2 KB Created: 2021-09-17 14:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fe2ad68658502207984b20c1a1a27ef4 SHA-1: e29f1e34d8a8431bf02a8bac150687fdfe8e8f42 SHA-256: 84b22fe9604e46e08bc717ca54d02db20cdadba9386a0916ea53b4909c8986e6
134 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to PDF files on disposable hosting, suggests a link farm designed to distribute malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the URL 'http://birdwatching.sk/media/file/pagidubujosepodu.pdf' with 'utm_term=adobe+illistrator+crack' strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://birdwatching.sk/media/file/pagidubujosepodu.pdf In PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/tegarexejabida.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/ziditujox.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/nonovoxus.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/xajalitewidazup.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/44199881956.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/46258098154.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/jilixa.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/xipalenamop.pdfIn PDF document text
    • http://acril.ru/ufiles/files/74882112699.pdfIn PDF document text
    • https://gjbuyerbroker.com/userfiles/file/73658140367.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/livifekebifumosunifimezom.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/90208561375.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/50370840537.pdfIn PDF document text
    • http://only-svet.ru/upload/files/77960699819.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/babajopegifumub.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/80118620738.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2d134b455---32116282862.pdfIn PDF document text
    • http://texmet.pl/userimages/file/26997596073.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/96999944422.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/goxaro.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/24723964013.pdfIn PDF document text
    • https://kimcert.org/E/file/22712864628.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/zopokebetupevifusiwe.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/30192323895.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=adobe+illistrator+crackPDF 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_off0000d9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EB 10472 bytes
SHA-256: d324d4645fc68b160febc0de871cd7ee4801fe651cbb2fdc9f00e94293e1ac9a
font_02_sfnt_off000109d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D6 17424 bytes
SHA-256: 4e446c6563e26d6f3b6a088a2c8dd929a0965e9f58d57eaca0d7ebfc5b8ebd0b