Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd78ca7dda89cc6a…

MALICIOUS

PDF

64.1 KB Created: 2020-12-13 13:17:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 115409ac3f065784c658d835f4d845ed SHA-1: 3baaee4d1ae8556788af423867a80b22f433a85b SHA-256: bd78ca7dda89cc6ae6fd84a59a9a9ff23f8a79c8fd3dc263b00a08bbadd44f19
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, with heuristics indicating it contains a large number of external links, characteristic of a link farm. The document body, though heavily obfuscated, suggests a lure related to educational content ('similes and metaphors worksheet ks2'). The presence of embedded URLs points towards an attempt to redirect users to potentially malicious 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
  • 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/wb?keyword=similes%20and%20metaphors%20worksheet%20ks2 PDF link annotation
    • https://boseveju.weebly.com/uploads/1/3/4/5/134595203/08a4ce.pdfIn PDF document text
    • https://ralirepiputup.weebly.com/uploads/1/3/4/8/134852471/vugepumilesisiw.pdfIn PDF document text
    • https://zexivuwesime.weebly.com/uploads/1/3/4/3/134356920/luveju-gabalijepiwig-barejotepitu.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/xubifupi/tetarofupanuwitato.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/hitman_blood_money_ps4_trophy_guide.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0eb456b97992eb55c2a22/t/5fc17a1b7acac6192af8b089/1606515227786/87745966662.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/division_2_hard_wired_component_k.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/putujisofutilevo.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/molar_mass_nacl.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/lipalabatajofixojit.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc10471c30a162e0c531f35/t/5fcb70bb8dcc5603bef3f18e/1607168187959/vodizetolevuforami.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/best_audio_interface_android_app.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_off0000be32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE32 5588 bytes
SHA-256: a41e869a302867d1c28b1b3ede17f2794f23d2a0eef1c032d14f8b870fffede3
font_01_sfnt_off0000d10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD10D 10220 bytes
SHA-256: d0e807ffb2c32a588bb0c29a8092b06e9906fc71bc36ffed2eb52ee4897991f5

Open this report in the interactive analyzer, or submit your own file for analysis.