Malicious PDF — malware analysis report

Static analysis result for SHA-256 96a24f35701e32f5…

MALICIOUS

PDF

72.0 KB Created: 2020-11-20 00:16:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 16e763b2ef292670f8ed926eb72392bf SHA-1: 1a1a9258110fdc77a845c481fedb5193d20fab20 SHA-256: 96a24f35701e32f53dfb3907095a4198b3e4fd63251bdcac37d457abc758ae93
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 numerous external links, with a significant number pointing to Weebly and S3 domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, appears to be related to 'spelling worksheets for 6th graders', serving as a lure to encourage users to click on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffset.ru/aws?utm_term=spelling+worksheets+for+6th+graders PDF link annotation
    • https://fategebedabeno.weebly.com/uploads/1/3/4/7/134718848/sokurinom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383912/normal_5fb2f6bcdda1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481510/normal_5fb583a2ee562.pdfIn PDF document text
    • https://bujupovira.weebly.com/uploads/1/3/4/4/134472582/wakizinava-xudatulup-wotezote-melufibupejozix.pdfIn PDF document text
    • https://febefuso.weebly.com/uploads/1/3/4/3/134382796/guzok-ginuvadixapiro-xarajisu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404116/normal_5fb447863d10d.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/subud/translate_chinese_file_to_english_online.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/wordscapes_answers_jungle_wild_4.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/list_of_words_beginning_with_the_letter_z.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/now_it_can_be_told_leslie_groves.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_off0000dc20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC20 5716 bytes
SHA-256: eeed1908889cf0638507a4a0042373e36fe956dd67fdc1524996ac2ef4afdd5a
font_01_sfnt_off0000efa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA6 10512 bytes
SHA-256: ea183434ef3e216490667b7d136a5c3b6e28c7085a9138fedc74bb6e7795b3c5

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