Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b42874fedef16d…

MALICIOUS

PDF

112.2 KB Created: 2021-03-25 16:41:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 4dc98400a11ea438eb0a3088f393cf85 SHA-1: fa6d568a8bd6791f91227c668640824b26b644f5 SHA-256: 81b42874fedef16d75815c353f6aded95c2998fc5b4c0aa077d22917a482405d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm pointing to a suspicious PDF. One of the embedded URLs, 'https://vilenefex.ru/strik?utm_term=what+is+sam+winchester%2527s+favorite+color', is directly associated with the phishing lure found in the document body. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://vilenefex.ru/strik?utm_term=what+is+sam+winchester%2527s+favorite+color PDF link annotation
    • https://cdn.sqhk.co/roratumopiv/xTXbjcE/sakupez.pdfIn PDF document text
    • https://cdn.sqhk.co/bunewonu/RjdhfXd/fegomejipegezimuviwuga.pdfIn PDF document text
    • https://cdn.sqhk.co/lekabadixi/XrsrhbK/vuxuzurepu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379610/normal_5feb0a54caa29.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458390/normal_5ff9c7769cbb7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gezexibubaju.rf.gd/vipudeduxifebisexi.pdfIn PDF document text
    • https://56148a0a-83a3-4003-94ff-78d3044b7c00.filesusr.com/ugd/6f5f23_9a85ee87f4844bfa8e3e68b8b98d8704.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/35111197288.pdfIn PDF document text
    • https://s3.amazonaws.com/nutanigonu/what_happened_in_1800_american_history.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/bagokibogemesusij.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/android_review_notifications.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/laravel_form_builder_select_multiple.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/jotedipug.pdfIn PDF document text
    • http://gozudivigel.epizy.com/gauge_invariance.pdfIn PDF document text
    • https://044ec7df-721b-4788-b209-87474a3fcb06.filesusr.com/ugd/60ffa2_0520365e50b14cd5956366be1449a744.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wifukedot/xomabunabiziz.pdfIn PDF document text
    • https://fa202315-5cd5-4006-9a99-7c5d4406650e.filesusr.com/ugd/61804c_ecd18d03c5f24800bc1af31f261c656c.pdf?index=trueIn PDF document text
    • https://e5b7f393-9b83-42c5-a877-5b85c0c772c8.filesusr.com/ugd/77b42d_c0a80f779de44906824a62550b734344.pdf?index=trueIn PDF document text
    • https://160e4e15-e27a-4ef2-9b26-f67fc0969a86.filesusr.com/ugd/cbdbb6_386b139beb74440c9a81327bb916ab8d.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C6D 5320 bytes
SHA-256: b41334cd225e7233da10d34843b3d52d99339974c4b5636c6c7eec323e62c70a
font_01_sfnt_off00018e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E7C 10992 bytes
SHA-256: e5cb319af2bed275953443efce0d4ec66dcf0b918bf95f457bccd4be28078e25

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