Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb232304a870c98…

MALICIOUS

PDF

77.0 KB Created: 2021-09-15 17:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8006327f7227a51449c8917665172529 SHA-1: 84e6d4c1924d91ec57c097438ea370e2a202cf62 SHA-256: 8cb232304a870c982df4fbe47416960277fd0a407456a9c8968e88d655bc65cf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Numerous embedded URLs point to potentially malicious or unknown domains, suggesting an attempt to redirect users to phishing or malware hosting sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights the nature of the document as a collection of links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://adci.vn/data/upload/file/64312349818.pdf In PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ee20c46d0---digeb.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/20057990745.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/ravujejonikinuripez.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/36866684433.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/56474833376.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/jufiliriberupuzarikel.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/89092268091.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/porogefodupazimadaramejo.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/63625453354.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16130c5547e2ac---18834011110.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/pepukuwiwizanodusewo.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/39089712023.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/16292272110.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/96042966060.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/2620816855.pdfIn PDF document text
    • http://immopolignano.lu/images/kawaworul.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/bikisegak.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/20370835082.pdfIn PDF document text
    • https://defi128.com/userfiles/files/74264125862.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/fajovokugugugazap.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/nejujukas.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/kalegemivoribavin.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/pududexujegilisewuxawib.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210906135829.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/12346805943.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/fajafememu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=can+android+app+run+on+iphonePDF 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_off0000ca9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9D 17152 bytes
SHA-256: 4f7adddf6b9086c0491ff9694ac6800242cc2ba9e3f4d6783e524b70f60423a0
font_01_sfnt_off0000f721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF721 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F38 10308 bytes
SHA-256: 15df8747d8e3ad1f1e9f1deae180e3bd12f14d21172f3ea0114dea5b59c2ada7