Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dda85293b8310b3…

MALICIOUS

PDF

86.0 KB Created: 2021-09-11 09:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 580e1c9247f0d5a69340c768455c7b49 SHA-1: 8ba58e29ed874da9ddc76209a533d1e5eb592834 SHA-256: 2dda85293b8310b3ba94e886bb48d0f626c923db6f5ae9e30aff773d07c54b7f
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs pointing to external sites, many of which are unknown or suspicious. This pattern is commonly used for phishing or to redirect users to sites that host further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://protectname.xyz/whoisprivacy/userfiles/files/85895004615.pdf In PDF document text
    • http://silverk.ru/img/lib/file/80866704941.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/44493050415.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/jagepowitasafemap.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/wupipawijod.pdfIn PDF document text
    • https://schmitz.cz/res/file/jupuzapeba.pdfIn PDF document text
    • http://scarpatti.com/files/41162437736.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109051808571735.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/xonosanuvov.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/12066464168.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/babemedafulofuw.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/sekozagaxafezukaxuwowato.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/63638147774.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/lixifurowoteba.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/papojuvafurujewoma.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff5142e3f7---88091484512.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/92646816673.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/57939696029.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210902064633.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/20924439420.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1613030b47053d---66119711078.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/76075804205.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/sesosimonipuxalufefo.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/mibijevonu.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/28638267414.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/97618678467.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=a+broad+definition+of+the+curriculumPDF 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_off0000ec53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC53 17364 bytes
SHA-256: c96362fbf8953def0fe4e97dc23a30ef2250973574c9ba7c956ff17b62fc3031
font_01_sfnt_off0001193b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13152 10796 bytes
SHA-256: 008bd7de10d8ed9c8b1604cbb6c0730c0b0ac71245c059a041310e3f3b11c908