Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ffd0a1be94df66…

MALICIOUS

PDF

68.7 KB Created: 2020-12-18 12:16:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: dc1d73557764914b3f54fbe9e6a507e6 SHA-1: 2ad6c86d2a050a3f89aeb6a2e06e5d051d53204b SHA-256: b8ffd0a1be94df668fd91633cb0a66f30fd8e42644c854c2bdda588bb9f24697
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous embedded links, with at least one pointing to a known malicious redirector. The document body, though heavily obfuscated, appears to contain text related to educational worksheets, likely a lure to disguise the malicious intent of redirecting users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/aws?utm_term=adding+fractions+worksheets+with+unlike+denominators In PDF document text
    • https://cdn-cms.f-static.net/uploads/4371783/normal_5f8f4d7d2af48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415308/normal_5f9f0d61ec5b6.pdfIn PDF document text
    • https://benerema.weebly.com/uploads/1/3/1/4/131408328/9162889.pdfIn PDF document text
    • https://sudororurupe.weebly.com/uploads/1/3/4/6/134602833/9546083.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473375/normal_5fc691d0e53c4.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/5fc0dc532e34347c7043ce2c/t/5fc1e8e22dd96f591833e676/1606543587240/mbo_goals_template.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4de962bbd7406581ff778/t/5fd6fc8de5ac58289637d414/1607924878718/free_song_boulevard_by_dan_byrd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acd4c2e7-2d20-4fc6-883e-a1c219301ace/27066335648.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2ca3a3dfdd95b60e15de0/t/5fd065b0a91a8d24337a213b/1607493044257/kings_road_cafe_hours.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdc79c85e71df64d6bd9c29/t/5fdc7b664ef20e41a29c34ef/1608285030681/pemupapojutuwenalos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4178f02-5924-42e1-af05-11eb8350fd62/olangal_malayalam_movie_1982_download.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f988e2fce462bc8c518c/t/5fc4c39de6d49a06bb28a3a7/1606730653543/romantic_love_images_tamil_movies.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf672a2dd96f5918e7230b/1606379308153/devudogegaxeguxupigiko.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_off0000ce00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE00 5580 bytes
SHA-256: 5db432570ea6787b0920e0ee1b5e561b935833cd08846b34b86add1f0992630a
font_01_sfnt_off0000e0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EA 10224 bytes
SHA-256: 596c7f5ce84eafc70eb6fc68e1223f9a9042a7c340eb98339869e674b8f7fd04

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