Malicious PDF — malware analysis report

Static analysis result for SHA-256 da2d612fe318b2ac…

MALICIOUS

PDF

82.5 KB Created: 2021-09-08 22:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 33ae6f6dab29aa5e651c4d797c845b5d SHA-1: b626649e0a6ebf847e3793b9458aeec46e599e15 SHA-256: da2d612fe318b2ace371b8d7ec71bc5d63fc61c868419e3b6a40fc41723d2bfe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are likely part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users through multiple sites. No scripts were extracted, but the overall structure and URL distribution indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://aspaeng.com/files/image/files/30762845608.pdf In PDF document text
    • https://anjingliar2.com/contents/files/54970954502.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/46984628273.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/zerojelixubowuzufedavofo.pdfIn PDF document text
    • https://faceless.me/userfiles/files/43128072471.pdfIn PDF document text
    • https://alutat.com/data/file/59310512521.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/razexodirosemoseborepuges.pdfIn PDF document text
    • https://scalping.ir/data/files/file/86283229791.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/xavepinixefinaliwedawax.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/najizoza.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/zuvapibe.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210903_0AE399203092F42E.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/202197_145836_199.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16135356c98517---xujijugat.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/52625542545.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210906095319370.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/jibasalogofewawonesekun.pdfIn PDF document text
    • http://evola.it/userfiles/files/19902409880.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/rilako.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/vubawumitoresufuf.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210904040415.pdfIn PDF document text
    • http://18554080.com/userfiles/file/17459888127.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/veler.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/sidulibolevakoguda.pdfIn PDF document text
    • http://silver1979.com/upload/file/domorarogizidigorapij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=dragon+ball+fighter+z+tap+battlePDF 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_off0000d9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CE 10668 bytes
SHA-256: b183e8d906cd602ace786257a625eff27dca296eeeb47b10b4d44c44c7d83c25
font_01_sfnt_off0000f1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EC 19208 bytes
SHA-256: 0f41dbe89730804e80fcf32a6d563b7f279489a459d5fefff37d2eb3ae4817c7
font_02_sfnt_off0001244e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1