Malicious PDF — malware analysis report

Static analysis result for SHA-256 6641d7d16c3575b5…

MALICIOUS

PDF

79.6 KB Created: 2021-09-19 15:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 215aae7119504c0cd637e7bf35713f6b SHA-1: 184f518fea3e6b1858156f744f90f043d61b217b SHA-256: 6641d7d16c3575b5a0b6f3798fb92e54d28053f2bfc10cd9f777d8b468315c4a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many of which point to disposable hosting and appear to be part of a link farm designed to redirect users. The heuristic 'SE_DOWNLOAD_BUTTON' suggests a deceptive call-to-action, likely intended to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=king+of+fighters+99+free+download+for+android PDF link annotation
    • https://kangaroovietuc.vn/webroot/img/files/rukitobafo.pdfIn PDF document text
    • https://bipalisdemo.dashindonesia.com/userfiles/files/22498450033.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/mewodexipipofibagubimipet.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a4ca58755---fopanidelitikozetiwufo.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/waxugug.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/bolabisolefiko.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/gotekil.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/xipagiku.pdfIn PDF document text
    • http://korytnica.net/data/files/xukijajenokojojimisu.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/sagabe.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/28659349974.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/liwob.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/36919133706.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/tabiloni.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/44643899914.pdfIn PDF document text
    • https://beautydent.hu/editor_up/wuzofupej.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/legelejubenawetalaj.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f078c6a304---64794861586.pdfIn PDF document text
    • http://boldogelet.hu/media/volaxufejowila.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/gepurafiw.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/zekufeluxagolasowurufem.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59957500762.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/doxowopuwonuton.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/pekefipifexexu.pdfIn PDF document text
    • 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_off0000ce51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE668 10880 bytes
SHA-256: 1668fce071aad5f44207f22ce0ef5dac466ec29f7327dd1c29795b02d076f205
font_02_sfnt_off0000ff5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5E 18724 bytes
SHA-256: 8932c32167d75a95457520c5df3209750b4a630cc135c59c86f655133ddcba1f