Malicious PDF — malware analysis report

Static analysis result for SHA-256 d28c4a2fcab64e32…

MALICIOUS

PDF

76.8 KB Created: 2021-02-20 11:23:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 5cd49f8333552e910a0b9daef020ded0 SHA-1: c17215e7c6de2755922c600bba4e5a31e13f90d2 SHA-256: d28c4a2fcab64e32bcc50ce2c6e6653f742a89f560ec904a1ced8d328d4c0a1b
126 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to disposable domains, indicating a link farm or SEO spam campaign. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially malicious or unwanted content, possibly as a precursor to further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://jacksth.ru/wix?keyword=love+nikki+guide+princess+chapter+4-12 PDF link annotation
    • http://leafester.online/40k_ork_codex_7th_edition8upzu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495691/normal_5fd337abf3ed3.pdfIn PDF document text
    • https://xurebutira.weebly.com/uploads/1/3/2/6/132681359/9585817.pdfIn PDF document text
    • http://ovca.space/camila_cabello_shameless_song_freeav3xs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373749/normal_600d54c6e622a.pdfIn PDF document text
    • https://zaduguwage.weebly.com/uploads/1/3/0/8/130874015/miduxitaviw.pdfIn PDF document text
    • http://hytri.com/the_great_gatsby_vocabulary_quiz_chapter_1_answers1z5es.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470027/normal_600fe921ad75a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386095/normal_601e56c76c08d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422658/normal_5fe670d9c6957.pdfIn PDF document text
    • http://barberking.best/play_barbie_games_without_ingk1br5.pdfIn PDF document text
    • http://homiak.fun/41832474451vpj8h.pdfIn PDF document text
    • http://doctora.club/triple_bottom_line_adalah3gvd3.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/wurivuve/aluminium_4x8_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/41229278149.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/rulotixonobaxibawimesox.pdfIn PDF document text
    • https://s3.amazonaws.com/peveziwoguxuzam/jateweninemusemili.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_off0000d8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E2 5672 bytes
SHA-256: 5a4f93982630685fbf464ead873379bfad845f398640f1a2a5c062b67d42ef19
font_01_sfnt_off0000ec50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC50 10268 bytes
SHA-256: d80f31afa53ee9d6e699e45f1990886bae8621e9eafca58ffa664986f491bd54
font_02_sfnt_off00010fb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB3 16416 bytes
SHA-256: af6545cc2318d27ecafec356b4bc3a1ae9bf93fb34fea327676f982b27d16dce

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