Malicious PDF — malware analysis report

Static analysis result for SHA-256 31392c0fc45ab95d…

MALICIOUS

PDF

62.5 KB Created: 2020-11-07 08:08:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3485af012eb6157452643ce17073e2f7 SHA-1: d93a9b4aad6bdde8685cd0af4a4f234527c39653 SHA-256: 31392c0fc45ab95dbfbebec8b70a794c2499592fbb6696aa81e5b20930ea4bbd
66 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffine.ru/aws?keyword=fascard+loyalty+card+balance PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371509/normal_5f893059ec5a8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://tuxabavijig.files.wordpress.com/2020/11/37940387668.pdfIn PDF document text
    • https://bigumipadif.files.wordpress.com/2020/11/brenda_lee_rockin_around_the_christmas_tree.pdfIn PDF document text
    • https://bemuxodozup.files.wordpress.com/2020/11/37289671030.pdfIn PDF document text
    • https://xexagaze.files.wordpress.com/2020/11/bse_odisha_6th_class_book.pdfIn PDF document text
    • https://radojosofu.files.wordpress.com/2020/11/i_am_a_rider_lamborghini_mp3_song_do.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e901a236-7195-488e-903f-7b402c192973/dasojebodis.pdfIn PDF document text
    • https://newagolufi.files.wordpress.com/2020/11/4900027547.pdfIn PDF document text
    • https://wotenopofe.files.wordpress.com/2020/11/budixaw.pdfIn PDF document text
    • https://gizibutabob.files.wordpress.com/2020/11/38274121116.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f36ed5f-d215-4b05-8b5f-4ceaa4fe7f89/zizobubaropapukaru.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_off00009fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9FC7 5132 bytes
SHA-256: 5d92bbaa5452f37009c0a3e9f9d59da3939fb8a03f4b04e231706955d624adf0
font_01_sfnt_off0000b14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB14E 11304 bytes
SHA-256: 863c7c22d404528044dc0888333ef53fb2b933f79a6282a4ac483b0c4bcb6485
font_02_sfnt_off0000d831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD831 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848

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