Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e58d8decd5f5dc0…

MALICIOUS

PDF

84.1 KB Created: 2021-09-21 09:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 356450eb3d7832773d78695de585acfe SHA-1: cd496d14098c119fd51b182a9acd9aa0a3b9b8c0 SHA-256: 6e58d8decd5f5dc069f28f79df839a45ca089ce6e960dfee3130e8cc88114c0a
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, one of which is presented as a lure for downloading a game, and is flagged as malicious by ClamAV and an ML classifier. The heuristic 'SE_CALLBACK_LURE' suggests a phishing or tech-support scam context, further supporting the malicious intent. The presence of numerous external URIs and link farm characteristics indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://inwebjor.ru/uplcv?utm_term=grand+theft+auto+san+andreas+download+obb PDF link annotation
    • http://miyozenemeryville.com/uploads/files/bukorosuf.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/23195836604.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/xifavagatuja.pdfIn PDF document text
    • https://lenaoyunlar.net/calisma2/files/uploads/2509822003.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/83872692176.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/sipawanivikusumus.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/41743332878.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/vudukurakititusozi.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/46702265937.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/jugelabuxizusiguxotamukor.pdfIn PDF document text
    • https://red-adlay.com/upload/files/rofelagenadudodinebutub.pdfIn PDF document text
    • https://casaalu.com/luutru/files/bikimuzitev.pdfIn PDF document text
    • http://sissonne.hu/editor_up/dunaposerasomakilujajexos.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/88419f2fc1ecd4ea56c9ce4e6665b2c0/78301732009.pdfIn PDF document text
    • https://bawauang.com/contents/files/87474697865.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/53785689396e38102bca2dd7d40d995f/56226748292.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/94983544875.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/miripijixebosuk.pdfIn PDF document text
    • https://guanlai.tw/uploads/files/202109121816098309.pdfIn PDF document text
    • http://c-six.it/userfiles/files/40432550691.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/25521696790.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/39303109200.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4b6611f84---27044245690.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/7306174578.pdfIn PDF document text
    • https://creativekids.abcedukacji.pl/web/uploads/files/15407177927.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_off0000d9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DC 21940 bytes
SHA-256: 1bdf6ee71eddb4987606d7c07ee8f730d165d05ad4688eac5a443cf1ab0845a3
font_01_sfnt_off000111c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C8 10724 bytes
SHA-256: c588b998d59b0e8668d95d95617b75782d4828fd3ed0959ea9d578b5cf8525ae
font_02_sfnt_off00012a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1