Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7c2cc0cfc894d8f…

MALICIOUS

PDF

54.3 KB Created: 2020-11-07 21:28:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 19b8b5c81a380ba21395b62d4b1a97f5 SHA-1: d783078ae844a293b481b23e5c9674dc597d17f4 SHA-256: b7c2cc0cfc894d8f76ac23aaaa9c1910f118d20d21d063549c361e8ce77360eb
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://trafftec.ru/123?keyword=writing+a+letter+templates+free+printable PDF link annotation
    • https://misutinulil.weebly.com/uploads/1/3/1/4/131407711/5378195.pdfIn PDF document text
    • https://folukufisika.weebly.com/uploads/1/3/1/3/131384255/pabelunodam.pdfIn PDF document text
    • https://sirawomaperuli.weebly.com/uploads/1/3/1/3/131398091/mopasizolowi.pdfIn PDF document text
    • https://bilewazivabo.weebly.com/uploads/1/3/2/8/132816117/4506530.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/dutimajizowa/amitabh_full_movies_mp4_down_load.pdfIn PDF document text
    • https://rakidate.files.wordpress.com/2020/11/52930778281.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/vobixan.pdfIn PDF document text
    • https://kebupud.files.wordpress.com/2020/11/16674380217.pdfIn PDF document text
    • https://vabavoresadi.files.wordpress.com/2020/11/debewasomogoro.pdfIn PDF document text
    • https://vadazigifexe.files.wordpress.com/2020/11/merozasopegujibe.pdfIn PDF document text
    • https://vipuvixo.files.wordpress.com/2020/11/nojanum.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/alias_summons_florida_statute.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/499b2287-2d3f-4dab-aaed-56a4ddae181b/blue_dwarf_star_define.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/volerebuluvajo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dba0fed-3809-4184-adb5-aca9b20609eb/rumetenetopenesovesi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000089d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89D9 5052 bytes
SHA-256: 16ad26992a721bc81b305f2a08416a5aefa2bbf9302a8371ae06e5ced43009a2
font_01_sfnt_off00009aef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9AEF 10376 bytes
SHA-256: 23bc29a3419228461ba221f88f73863d95ca805dc0e68a31245df11022e97658
font_02_sfnt_off0000bde9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDE9 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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