Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d8cb0ac2764bfe…

MALICIOUS

PDF

72.2 KB Created: 2020-12-25 00:53:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: f774eb8c7a279749774e75c247899878 SHA-1: dd693752859913f0d84f676a9a54fa81300a34d4 SHA-256: f8d8cb0ac2764bfe0b987d4b1bc6b1e2eda8b1f9fc18325c7ed6492052a06479
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, and is detected by ClamAV as a phishing trojan. It contains a link farm of 24 external PDF links, many hosted on disposable domains, with the primary lure being a download for Minecraft Pocket Edition. The embedded URLs and the PDF structure suggest an attempt to redirect users to malicious sites for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://traffset.ru/123?utm_term=minecraft+pocket+apk+download+v1.11.4.2 PDF link annotation
    • https://natizupasa.weebly.com/uploads/1/3/1/4/131437725/68e05292e2.pdfIn PDF document text
    • https://zamosokajuzosa.weebly.com/uploads/1/3/4/6/134651904/kaguwes-xesom-delolefarilusi-tanopow.pdfIn PDF document text
    • https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/tixijokam.pdfIn PDF document text
    • https://mibakadediwo.weebly.com/uploads/1/3/4/5/134584598/4583085.pdfIn PDF document text
    • https://fazolusafiwef.weebly.com/uploads/1/3/4/5/134585025/bavokisojises-lurisubixoso-duvis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476142/normal_5fcb54a1ae067.pdfIn PDF document text
    • https://kuvofexe.weebly.com/uploads/1/3/1/1/131163751/57995.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445532/normal_5fca411a676aa.pdfIn PDF document text
    • https://kifobanirijo.weebly.com/uploads/1/3/4/5/134595275/nonoxej-xadujoku-wutew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/32d9652f-cc66-4922-b2fa-f3a71f0230c7/nebizujetugubo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfd82435-3cbc-4f99-80b7-1d8f468a8c2a/94317509377.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/probation_report_calhr.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA2 5284 bytes
SHA-256: f2ed7dd80256c6941c545d70fb69d0c1cdc7043003944cbad2f1bc5f6e8bbfdf
font_01_sfnt_off0000e1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C4 10476 bytes
SHA-256: 34692dca9c28c11371b48f23b0f4b827c1bfb5edfe4a79856dc065b49d342fed
font_02_sfnt_off0001056e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056E 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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