Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cdf24095ab1f886…

MALICIOUS

PDF

78.0 KB Created: 2021-01-03 12:51:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: d5d93e873d44b3b26e56c8d4db634e89 SHA-1: 40f9cc26ac201e50b590adce2003adbf18089ffb SHA-256: 1cdf24095ab1f886568ad0342db3702b8868dd1ca5e3503e9ceb1277dc4b3b06
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains an embedded URL that directs users to a suspicious domain, likely to deliver a malicious payload or phish for credentials. The document body, though heavily obfuscated, suggests a lure related to educational worksheets.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffnew.ru/aws?utm_term=english+grammar+worksheets+for+intermediate+level PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475577/normal_5fa998cfe476e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394060/normal_5fabab58094e9.pdfIn PDF document text
    • https://jeluvuxibobuna.weebly.com/uploads/1/3/4/0/134017570/zelogilolinuvemaramo.pdfIn PDF document text
    • https://ropojagininu.weebly.com/uploads/1/3/4/6/134635708/d8087bd2f9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492918/normal_5faabd7d34901.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485943/normal_5fdb2856141f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372100/normal_5fdb98e3518e2.pdfIn PDF document text
    • https://liwevapazu.weebly.com/uploads/1/3/1/0/131071299/765185a6b0b324.pdfIn PDF document text
    • https://sakafafemowuva.weebly.com/uploads/1/3/4/6/134694971/28be1f7b9d51ee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lanaladu/reporter_meaning_in_malayalam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bae2800a-c546-4cb9-b065-5d5ee1b06c58/30300360483.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cbbb67d-bdb3-45f3-9b8b-cfdfb8718bd3/zamop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34f5da48-8156-4a9c-b957-fde36f5a0cad/69424164628.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
    • 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_off0000dc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC61 5496 bytes
SHA-256: 133220e82649eee864b4553b01001549a1ef028ce45d94cd8c99bd425e87e800
font_01_sfnt_off0000ef07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF07 10864 bytes
SHA-256: 8a9c0442e11a96b489ec3182d8863834c3d35a7de604274424c1b3fe2e1641d1
font_02_sfnt_off0001143e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143E 16508 bytes
SHA-256: bf0029f2f65a8d03fc5bc6dac3f89872448ee76276b38fcd79a4881ba082e330

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