Malicious PDF — malware analysis report

Static analysis result for SHA-256 a562839fdece7c5e…

MALICIOUS

PDF

73.3 KB Created: 2021-02-16 08:23:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: a8cbeabd494edbf7542e31839f8327d3 SHA-1: 60d706613cca25195a768f444f8db68e7d3852e9 SHA-256: a562839fdece7c5ef8b267cec36f25a94868fce228daf8b2e406b62169e170da
66 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm. The ML classifier strongly indicated maliciousness, and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the suspicious nature of the links. While no scripts were directly extracted, the structure and embedded URLs suggest an attempt to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/wix?keyword=del+valle+middle+school+del+valle+tx PDF link annotation
    • http://chambrehub.xyz/android_name_id_app1mi7y.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/ggdgehe/87447391062.pdfIn PDF document text
    • http://freds.space/gasiderakoxijunagu4lc7.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/qRihUeR/monument_valley_2_game_review.pdfIn PDF document text
    • http://securespot.ru/jimmy_choo_choo_song_djyoungstergdvqg.pdfIn PDF document text
    • http://befigter.xyz/celi_3_testpkb4l.pdfIn PDF document text
    • http://introdom.ru/gavazegawunasazevisazogo2.pdfIn PDF document text
    • https://cdn.sqhk.co/vizelupavew/ighj2gi/nuclear_chain_reaction_definition_in_physics.pdfIn PDF document text
    • http://mnclassis.org/14118799224at7x4.pdfIn PDF document text
    • http://justamorem.com/15632574666vllgv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rufolexuvolup.epizy.com/lacher_prise_meditation_guidee.pdfIn PDF document text
    • http://xevaxujexodo.epizy.com/rekepuzi.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/23935194819.pdfIn PDF document text
    • http://dakunexafabeve.epizy.com/6718848248.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/hillsborough_county_school_grade_report.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_off0000e200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE200 5208 bytes
SHA-256: c7ff6dd2f60a3f4cfde6af8de23d269859779052c688eb8da44576aa56d591cd
font_01_sfnt_off0000f3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A6 10644 bytes
SHA-256: 6f9bf7416d8176afc6fca73e3a057d6ef88e7221aa8268657deb55510fac3c45

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