Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c9e9c15a837e10e…

MALICIOUS

PDF

82.7 KB Created: 2021-09-21 11:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9255956f52701360289442f34e93e9c5 SHA-1: b8164401b77de321f45a1d7c6d51db09a56de462 SHA-256: 6c9e9c15a837e10ee16c8f63cd580b1f5f35df06769c08fdc815bc021c434fbf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many on disposable hosting and configured as a link farm, suggests a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to a tactic of using many distinct hosts with few links each, likely to evade detection and distribute a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=mx+player+pro+download+for+pc PDF link annotation
    • http://matras-devison.com/upload/file/kozofewumejuwefux.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/24399985079.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408d2c7921d---zijufekagaz.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/77625984174.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/wubaf.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/97992485133.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/xenafegatavuw.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109200409278501.pdfIn PDF document text
    • http://tiquital.com/documentos/file/54189229649.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/67762398575.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/89237002173.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/2689525414.pdfIn PDF document text
    • http://poliinc.com/upload/files/lepifevimem.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/ritukozifufowosovefa.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/38323685700.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/gubudebapufefepijogi.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/7931008460.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/rifonugavejap.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/81212249436.pdfIn PDF document text
    • http://usateatop.com/_upload/files/2619150356.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/dimilejerij.pdfIn PDF document text
    • https://theipbuzz.com/images/file/xatabedagatipafimuniripir.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/85759083855.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/80503751766.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_off0000ddfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFE 10552 bytes
SHA-256: 099ecd938d04776eefe20d1e65c4db2af43a4eccc5d106d23e7d6df2cb489848
font_01_sfnt_off0000f640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF640 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E52 18440 bytes
SHA-256: 21dfd66e1d3ae91950ba913086938da9a53bc53ef72b55e7219bc82af17ff71c

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