Malicious PDF — malware analysis report

Static analysis result for SHA-256 78b835d62d32c143…

MALICIOUS

PDF

70.5 KB Created: 2020-12-04 22:18:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ff96f0ad546aa42342db67420d5d65be SHA-1: c0da7b57dbcb173d018f7f77182710304fda9e8f SHA-256: 78b835d62d32c14304fd9888af944c0e11f28a4fb542eb9cf9031ed4282ccb5f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a mass external link farm, with one prominent URL pointing to 'traffnew.ru', suggesting a phishing or scam attempt. The document body, though heavily obfuscated, appears to be a lure related to programming solutions, likely to trick users into visiting the malicious link. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://traffnew.ru/aws?utm_term=c+class+template+specialization+hackerrank+solution PDF link annotation
    • https://lukimozogu.weebly.com/uploads/1/3/4/6/134638062/volowobetoletofik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496580/normal_5fbf8a42c0c11.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412174/normal_5fc74cf13c732.pdfIn PDF document text
    • https://pebezudaxefen.weebly.com/uploads/1/3/4/3/134347708/90b05ae.pdfIn PDF document text
    • https://nikokabiliru.weebly.com/uploads/1/3/1/4/131409463/412712c4.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/7304884.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0e0febe9b6939510aa6a3/t/5fc9577ae3a31b0ee715a6f7/1607030653409/60724685107.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/63925010208.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b92c7c5-fd38-4380-9e35-eb6dcdf2aefe/xuridusupokajelezose.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0ea21c30a162e0c52977d/t/5fc2ef66e6d49a06bbf438c1/1606610791731/65560237401.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0ec955687f52b6b8145c1/t/5fc1d3221972c46e3ce1b3f9/1606538019089/rosemary_gladstar_medicinal_herbs.pdfIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/jozokifa.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe29c708845d0924541030/1606298057698/kafetawexanizowagaxak.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/apple_id_spam_email_report.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D8 5192 bytes
SHA-256: 34383af55ab7c83d2545ff0934771c6efb6265c6137fd1e49121d6c3503ea9db
font_01_sfnt_off0000e257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE257 12740 bytes
SHA-256: 1bd7b0fda36ee1321435e9369de8c524e7e51abc8a3c5435eccad71766ed9cd8

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