Malicious PDF — malware analysis report

Static analysis result for SHA-256 933ccc261a76614e…

MALICIOUS

PDF

50.4 KB Created: 2020-11-09 08:48:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 2fc6471a683e7d9b651dba635134b0b8 SHA-1: 959a4f70ed435a62da465bfa0cd4990ccd8e3179 SHA-256: 933ccc261a76614e8310fa374beeadad7683bb1fd07b5586307f7f61db55f399
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://trafffi.ru/123?keyword=sea+turtle+from+finding+nemo+name PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366010/normal_5f87899c97381.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379029/normal_5f8ed49ac3644.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0194bdaf-b372-495d-b85b-95a6ad4afbc0/rodigekakujalizi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66c967a0-a6c0-42b8-b01d-f73e356e4652/13696776103.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22ea2c25-133c-4562-8b40-932d7f8954ce/15828556931.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43820cd3-a295-4403-857a-bac34957e541/xomudujudi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40b1c83f-c16c-4143-ae7f-036d54bdf166/womuwukajemasi.pdfIn PDF document text
    • https://vabavoresadi.files.wordpress.com/2020/11/debewasomogoro.pdfIn PDF document text
    • https://s3.amazonaws.com/juzalizuvar/94818182872.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/92611551994.pdfIn PDF document text
    • https://s3.amazonaws.com/kevava/eritrean_women_cultural_photo.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/99997429267.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/binazilozagazogopipesu.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_off00007054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7054 5152 bytes
SHA-256: 19b505abb1113e5c5e33f2f63691b4d67706437dbba9e6acd732e6c375816bec
font_01_sfnt_off000081c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81C2 10508 bytes
SHA-256: 5bb3bb08801113fc887a9fd5c1c06a7aa779c703c39ae6cbe6781ed6fa54718c
font_02_sfnt_off0000a5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA5F8 16448 bytes
SHA-256: bb0a23e57285d99c952d822ff851c62049f57a81dc0609846eed0948e9d7ccd4

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