Malicious PDF — malware analysis report

Static analysis result for SHA-256 1087fc462c02b59b…

MALICIOUS

PDF

80.4 KB Created: 2021-09-18 09:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 71160207c8679f13e7bf3270b41f0211 SHA-1: de9c5c56d9306a2934f6462bc91a19eb5b25ba66 SHA-256: 1087fc462c02b59b87e76d9d19300de365f36059db31d2cd4a72086961787b5e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to suspicious domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by identifying a link farm structure on disposable hosting, often used to obscure the true destination.

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://samsungklimalar.com/upload/ckfinder/files/favopigukiwufu.pdf In PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f96f0c7d0---9126515713.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/sipugetonilux.pdfIn PDF document text
    • https://olterus.info/contents/files/polurisedaduwelididozoni.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/71131536889.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/nejifinigiwuz.pdfIn PDF document text
    • https://rcot.org/userfiles/file/9813551176.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/lijil.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/39437154212.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/202191618485635.pdfIn PDF document text
    • https://biocoils.com/img/file/bojoduvaxinijigodedaza.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/talubafojadizelobunixi.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/17635625998.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/kodikuponig.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/perefuto.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/84038117973.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/81726494302.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/xozurakupe.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109100715189599.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210902142311_vmdngo.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/58718978145.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/35035460412.pdfIn PDF document text
    • http://aromata.ru/upload/files/kikagotamejebota.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=adclear+apk+proPDF 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_off0000d606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD606 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1D 10120 bytes
SHA-256: a3c5ee3769b0bc8984d3a735713a8f138f7c482fcb3a48385f95f738405e6444
font_02_sfnt_off000104c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C9 18112 bytes
SHA-256: beb50f5c1471bc89dd97bf8e63265e33ee8d2ee61ff624f67f1e3505e1946eba