Malicious PDF — malware analysis report

Static analysis result for SHA-256 d178c1fbb7b56828…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 21:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: eb02e61faef1f78c7f9c0a576561b5e5 SHA-1: b6c68582372cbad1509dc47002cd832c2cf6e043 SHA-256: d178c1fbb7b568285805226f5c77be29a60c935595e741cfff1a6b533b59638e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many pointing to disposable domains and forming a link farm, suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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.
  • 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://postele-z-masivu.sk/ckfinder/userfiles/files/31382575949.pdf In PDF document text
    • http://vietdubai.com/userfiles/file/niwazedanumafitigajidugiz.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/vegubup.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/11718203779.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/zuwava.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/gudusakominup.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210905120016114721ysi3amf4ye20.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/36290223597.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/gokeseril.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/dobemilovevirogi.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/kebozisusapifazataw.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210908_B1E7DAF337612DC9.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613be170b225c---guregebik.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/61827674343.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/afax.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/rojaraxokal.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/lazodadimamomakazagozakuw.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/laxegowusagidinasiv.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/89144290407.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/78845117129.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/65021981518.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/57772418653.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/65074296606.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+get+push+notifications+on+androidPDF 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_off0000d97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97A 18200 bytes
SHA-256: af9f2b9c1c143ff7bf35aaf9e2c236a711b98b310cd8b31cdfb4911d905357aa
font_01_sfnt_off00010851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10851 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12068 11028 bytes
SHA-256: e45f8a3909df209e9d7ad61e63a30fc5ca7d0c56e91d75d6a5e3071ca052c54d

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