Malicious PDF — malware analysis report

Static analysis result for SHA-256 56011ccb1fe5b2ae…

MALICIOUS

PDF

81.2 KB Created: 2021-09-12 00:02:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 62bcea9aa584b26cfea8e4a77a96a414 SHA-1: b182ec1df3cac5420acd403cc7b8fda2785904a2 SHA-256: 56011ccb1fe5b2ae33be6d0de43d8535afbc6d768743c9e055dc58108a77b599
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many pointing to potentially disposable hosting, suggests a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1613d191051618---5955313757.pdf In PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/17228323082.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/nusemozomo.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/29243785156.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/59989335425.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/bapovilagabew.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/xoxogotivaporadizi.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/5498660651.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/74569231833.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/42487549076.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/tiwudo.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/86928537043.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/rogumid.pdfIn PDF document text
    • http://canadianrockies.info/files/file/4407049069.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/54358274430.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/47698684916.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/tisafebokopegidamomod.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/84205441939.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/56738265750.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/vofuwefarezonure.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/i65p0erdk96c7ipppgmmq7ajr2/42212479439.pdfIn PDF document text
    • http://topflexsports.com/uploads/35100315542.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=present+perfect+present+continuous+exercisePDF 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_off0000d890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD890 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A2 17944 bytes
SHA-256: 13ecb45ee9afee6607f56db89f19acae5e74ee0220bd7bcca5c4c5951b67b0f2
font_02_sfnt_off00011f09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F09 10468 bytes
SHA-256: b36373c21b501e23d58573b900bef88e905333fa3abc276ecc1153cae9f69f2b