Malicious PDF — malware analysis report

Static analysis result for SHA-256 177b9efe9411d279…

MALICIOUS

PDF

82.4 KB Created: 2021-09-21 06:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 35c8d34a4c248592324c816b7de6f921 SHA-1: 7f081c70e6211c8fb3d5c8f43f65f5af7910eb15 SHA-256: 177b9efe9411d27964544af1be40a314a30bf25b390b7c0388726a014c314c6d
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a 'Password-protected archive handoff' heuristic suggests the document is designed to trick users into downloading an encrypted payload, likely for further infection. The numerous embedded URLs, many pointing to PDF files on various domains, form a link farm intended to obscure the true malicious destination and evade initial analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://ip-pharma.net/data/files/maravetavo.pdf In PDF document text
    • http://letnipohar.cz/upload/file/fizafepodisibadesame.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/lededetujinulusujugo.pdfIn PDF document text
    • http://net-marketing.hu/images/files/fapuxu.pdfIn PDF document text
    • http://sapthagireesyathra.srikarpagavinayagamills.com/userfiles/file/70517899368.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210901_174228.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/26592194608.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/56968969134.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/17946320121.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210919184447.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/ginudenufiluwibuparuger.pdfIn PDF document text
    • http://cycling-software.com/files/file/jidexa.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109150111051224.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/90180180074.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109070058298521.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/5625620950.pdfIn PDF document text
    • http://adriennemason.com/assets/files/moziw.pdfIn PDF document text
    • http://getvisa.ru/images/File/lujofopolifumazulelojed.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210913074229.pdfIn PDF document text
    • http://topliving.sk/userfiles/file/61007661803.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1631134565.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/24563237577.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109042031409624.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/dogupe.pdfIn PDF document text
    • https://vilnius.cvzona.lt/resources/img/files/13772942198.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=china+tablet+a33+firmware+downloadPDF 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_off0000dbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F0 10880 bytes
SHA-256: 4bec93b9c82728b261028fae7da36724baf52349108219eb2014e29cf484d59c
font_02_sfnt_off00010cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF7 17940 bytes
SHA-256: aaa95e62f65650247fe4153a1fc6974de73723603c0536adbe6fb34670f0b3bf