Malicious PDF — malware analysis report

Static analysis result for SHA-256 828893ba8ddff56b…

MALICIOUS

PDF

85.3 KB Created: 2021-03-23 15:35:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0b8ec0ae101e5fe32e5cb312ff047986 SHA-1: 1a6ef012e298950ae2ea280583e15a46135b4f7f SHA-256: 828893ba8ddff56b99a8cc2bc22f42afb1aebc41f4e4a1146117cd32241dae52
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and 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 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/award?keyword=calque+translation+pdf PDF link annotation
    • https://nezivubu.weebly.com/uploads/1/3/1/3/131384481/zorobivaniji-baloxetigu-vavol.pdfIn PDF document text
    • https://cdn.sqhk.co/sotatixorawi/YhifHjc/harry_potter_polyjuice_potion_punch_recipe.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/dgeUjgi/unicorn_dash_online.pdfIn PDF document text
    • https://cdn.sqhk.co/dasewugiru/Fiizidp/movie_showtimes_calgary_crowfoot.pdfIn PDF document text
    • https://cdn.sqhk.co/fovomesit/bheWDHZ/4038228219.pdfIn PDF document text
    • https://cdn.sqhk.co/rosisole/8GeMjcT/kezusujoj.pdfIn PDF document text
    • https://cdn.sqhk.co/nomuzali/jhfqhiS/new_sport_games_3ds_xl.pdfIn PDF document text
    • https://tikepewovexa.weebly.com/uploads/1/3/4/3/134317170/fawimejani.pdfIn PDF document text
    • https://cdn.sqhk.co/loganidob/Rhgkfij/boxing_hero_punch_champions.pdfIn PDF document text
    • https://cdn.sqhk.co/wowasuperan/eGggGhg/minecraft_1._7_2_full_version.pdfIn PDF document text
    • https://cdn.sqhk.co/pofaxiniraz/aifijgj/hypothalamic_orexigenic_signaling.pdfIn PDF document text
    • https://kazenatujexisof.weebly.com/uploads/1/3/1/6/131637291/6d7c42f67e.pdfIn PDF document text
    • https://cdn.sqhk.co/posukomokufi/ih4ijif/gaburawikisurumijepuzidal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492900/normal_5fd0eac2309b5.pdfIn PDF document text
    • https://cdn.sqhk.co/guvevifowo/heghCjc/vawigadifove.pdfIn PDF document text
    • https://cdn.sqhk.co/kojariwirip/bhbwXjh/setikuvunuzilejavob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370275/normal_60138d66dc3bb.pdfIn PDF document text
    • https://cdn.sqhk.co/lapefuxolu/jfjf7sM/57087043911.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_dffa806de2af471696c0bebd3be9ac56.pdf?index=trueIn PDF document text
    • https://bc260b4e-efc2-469d-9102-9c7234992d76.filesusr.com/ugd/b1b3ad_0e3d68977dad4f3dab94b8bde415d71a.pdf?index=trueIn PDF document text
    • https://a0d2adcf-75bd-42a9-a42a-c23e1c6e9e1a.filesusr.com/ugd/85c99c_1f737613b5024bb5a0bdf81932ef63a7.pdf?index=trueIn PDF document text
    • https://2ed9768e-82a7-41f7-bc91-4b86d8d7aa0f.filesusr.com/ugd/bdbd91_61625f27ec344c86b6e5950f5428221b.pdf?index=trueIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AE 4124 bytes
SHA-256: 298d968811d9d1020e63de8b155b961a3ed5847a464b615537cd18319db02171
font_01_sfnt_off0000f71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71D 5064 bytes
SHA-256: 076a0c4fa43511263a9dd9b316f194deaf91f17a513a6955a31f6dc6d165e0af
font_02_sfnt_off0001085e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085E 13368 bytes
SHA-256: af70ae975e0dc968e751e9ab43c04449d26561b517bdfa7e76b1de230e62e46e
font_03_sfnt_off00013299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13299 16096 bytes
SHA-256: 292b67320f20e7e38814323bff47001ccb55b5eebb397aea8a254f3e91f57b87