Malicious PDF — malware analysis report

Static analysis result for SHA-256 575f2fed31b25e19…

MALICIOUS

PDF

87.3 KB Created: 2021-09-18 02:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b620523ddfa5c28b6b3620bc95a7dc39 SHA-1: 24f631aec983b205e1e30c5fa584bc1ac43b0471 SHA-256: 575f2fed31b25e19e7ff5f91bc4f0389ef62e7ba109af7c93a442d3247793c9c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, a common tactic for phishing or malware distribution. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download an archive, which is often password-protected to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131abf092986---pofipiw.pdf In PDF document text
    • http://nhactheducthammy.com/upload/files/pamiwiwavodevitofisel.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/10429169046.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/27299263614.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/66478743928.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161376ee6dbb63---85792033508.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/77375427102.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/10830915183.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/makiwenogulaginedobarazox.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210911_15AA211209F13B49.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///refepaw.pdfIn PDF document text
    • http://thietbianninh188.com/uploads/files/mefawilemoto.pdfIn PDF document text
    • https://angkalaris.com/contents/files/nevigusovitu.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/14516033793.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/10133933121.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/bixatobitixepan.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/rekovibesipimupatu.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/dajejunevenivo.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/15087561276.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/6472838793.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/47261676029.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/pusopoxamefenu.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/vozopowuzidurazufuket.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/56053821031.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/virirekomigulujofetobumo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=caller+skull+movie+app+download+for+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_off0000ef74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF74 10936 bytes
SHA-256: 40ec8e6c87f17a55cfe39eaf42bc3d913e4f449d4e08a4def201eeb4805586f4
font_01_sfnt_off000108d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E6 17784 bytes
SHA-256: 404473af857e8357104431f35ffb214f75e53505c13b361f93b2571af1b786f5