Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbd99fabc744c96c…

MALICIOUS

PDF

74.9 KB Created: 2021-03-15 02:13:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41d836cff98ae42c254108669fd7e7b8 SHA-1: 177db02151d871dc239224fb5a1c290461d1608a SHA-256: fbd99fabc744c96c498a9a69eaf91b02371231f6b2564dfcd188a7fa21336c77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and a ML classifier indicating high maliciousness. The presence of a large number of external PDF links, many pointing to unknown or potentially malicious domains, suggests a link farm or SEO manipulation tactic. While no scripts were extracted, the PDF structure and embedded URLs strongly indicate a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/award?keyword=mario+biagioli+pdf
    • https://nuxabofubuwaxef.weebly.com/uploads/1/3/2/7/132740905/1473482.pdf
    • http://dvestideyli.xyz/nom_024_stps843qv.pdf
    • https://cdn-cms.f-static.net/uploads/4401983/normal_604d390279365.pdf
    • http://tevuvisena.iblogger.org/chinedum_official_video.pdf
    • https://static.s123-cdn-static.com/uploads/4423427/normal_5fdfcf66630a5.pdf
    • https://wosobariwosamu.weebly.com/uploads/1/3/4/3/134372044/jimaguverezizup.pdf
    • https://botamelojobowi.weebly.com/uploads/1/3/5/3/135344227/fbd7bb84f6381.pdf
    • https://vapevaka.weebly.com/uploads/1/3/1/4/131407737/sutabanakage.pdf
    • https://dejatenuti.weebly.com/uploads/1/3/5/3/135348415/botatizora.pdf
    • http://doordash.link/wopinotetavomubohzmv6.pdf
    • https://cdn-cms.f-static.net/uploads/4414682/normal_602960909e03e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://944bcc21-9f45-42c2-9889-8cf837fa5d1c.filesusr.com/ugd/50f869_500a479c6bcc4ce585dc8d572a120ad0.pdf?index=true
    • https://b73db3ac-2e3c-475a-83ab-7f4668f00a8f.filesusr.com/ugd/80e8fa_de801114498948deb2981a25c5622a09.pdf?index=true
    • http://mesobuze.epizy.com/54182235222.pdf
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_08a5fb10c7444e4e89bc257f0d0caa8f.pdf?index=true
    • http://metamedixepogob.rf.gd/tavabebolowesapagilamuxib.pdf
    • https://uploads.strikinglycdn.com/files/b6235b79-bbc6-4cb0-bab0-562d9588ab5a/vefemij.pdf
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_04129236deda4c54a053e64a2c137e4e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/21a30c73-eec8-4568-980c-1fb62d9f2215/67862897956.pdf
    • https://uploads.strikinglycdn.com/files/d81ca21a-3845-485a-8f9b-60ad5ef00fa7/zajubafofamipiliba.pdf
    • https://d75bbb92-b0e4-4b50-83e6-2443e695523b.filesusr.com/ugd/bc73b9_defb60d5cd3f4ec58fb11c3102a32fb2.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e71c.bin
f157182cd1e9aaed28dcb6eddc1e02b07fcc11655ae562823e01b9d839ac43b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE71C 5176 bytes
font_01_sfnt_off0000f8d3.bin
ff68ff9daaea02e86e9b2002af494413faacffa8778471a267326338aab0d9cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D3 11044 bytes

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