Malicious PDF — malware analysis report

Static analysis result for SHA-256 214165314af911f5…

MALICIOUS

PDF

80.5 KB Created: 2021-09-15 13:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a34828f99e5057e7dfcf07023d04ff06 SHA-1: dd6f37d14ed887878c2e0547d5d1a684d72e54ca SHA-256: 214165314af911f532eaaea382177cc4dc0078126951679fc0a1d2fe9208b92c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, strongly suggests a phishing or link-farming attack pattern. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://chcial.ru/uplcv?utm_term=gta+san+andreas+store PDF link annotation
    • http://kanalizace-ul.cz/userfiles/file/wumasisara.pdfIn PDF document text
    • https://oldd.adventurenetbg.com/userfiles/file/nosejudesufonedupugexor.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/52889668126.pdfIn PDF document text
    • http://watch62.ru/files/files/pafawalojobekivob.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/a299a8c7e9f11a837ac4fc05c10dafd7/13230801138.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/konuxu.pdfIn PDF document text
    • http://polkovnik.su/upload/file/tutede.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/tibobepotuwe.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/90297670464.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210915_8027E8200A875B69.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/75281189117.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/78358498169.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/wujekinubogelusi.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/fefanidojojigewa.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/74527600519.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/5986334424.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/42547392058.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/ludud.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161369e706f5df---disapo.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/nuxewedovozubizawowode.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/71244037258.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/76007100009.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_off0000d481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD481 18864 bytes
SHA-256: cfe99eb74d5fd9445b30bbb30a0781830b7cd42f16bd399a52d1ddd87200a876
font_01_sfnt_off0001059a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB1 10140 bytes
SHA-256: ffd4d0fa6a32c434e8d9e04c00b3eb54cc39ab1fbb9a688b4f018bcc6bd996ae

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