Malicious PDF — malware analysis report

Static analysis result for SHA-256 290def543bb78bdf…

MALICIOUS

PDF

76.4 KB Created: 2021-03-01 00:43:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 98527c2f3ca28fbbc12b74bf71ae6a49 SHA-1: 9bce40efbb14701ed4446cfddb759cf34b649c03 SHA-256: 290def543bb78bdf387638093e65c494a81e78c2b9e519987092361e281c18e5
66 Risk Score

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 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://golowaki.ru/123?utm_term=madden+20+strategy+guide+book PDF link annotation
    • http://itrom.fun/474590726530hvl1.pdfIn PDF document text
    • http://greenbike.shop/jodogajijasufabomevofuw9pkks.pdfIn PDF document text
    • http://miromawetibikew.mywebcommunity.org/suvudewivakaxuxoradedetuv.pdfIn PDF document text
    • http://apeech.ru/gokonujawosekx4rbk.pdfIn PDF document text
    • http://mujabelor.mywebcommunity.org/toshiba_dvr620ku_record_vhs_to_dvd.pdfIn PDF document text
    • https://sitimewodojex.weebly.com/uploads/1/3/1/8/131856527/wobarixezer.pdfIn PDF document text
    • http://dusosax.66ghz.com/angadi_theru_songs_video_free.pdfIn PDF document text
    • http://juzajikadig.22web.org/94457652615.pdfIn PDF document text
    • https://wavikifetin.weebly.com/uploads/1/3/4/9/134901048/627deeb45a6fa8.pdfIn PDF document text
    • https://lonofajizol.weebly.com/uploads/1/3/5/3/135389348/letager.pdfIn PDF document text
    • http://cuzinfo.ru/95567399079by8yi.pdfIn PDF document text
    • https://kofagegupuk.weebly.com/uploads/1/3/2/3/132302723/0df30618b09.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kibototudezusob.epizy.com/marshall_avt150_amp_head.pdfIn PDF document text
    • http://rijujala.epizy.com/printable_3d_dinosaur_cake_template.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_off0000eece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECE 5548 bytes
SHA-256: 0c14a80108a4701e869c3b6f72f56c66c56be6d465ac2149d64ba4e7887b04c4
font_01_sfnt_off000101c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C9 10140 bytes
SHA-256: bc631b157399971f3ad33a888c6846158dfd01e1de072f6777cacb99b1e4483d