Malicious PDF — malware analysis report

Static analysis result for SHA-256 945567c9b6ee79d8…

MALICIOUS

PDF

76.6 KB Created: 2021-02-14 07:51:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef34205e9301f18e31704e71fab540fe SHA-1: 998d16a1a64615925002012bb24331c5bc40cbbf SHA-256: 945567c9b6ee79d8e79f398e1ed4797d63da86ea8eb52a3939cbd8b0b5b176e1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to file-sharing services and potentially malicious domains, indicative of a link farm or phishing lure. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the heuristic firing for PDF_SEO_LINK_FARM strongly suggest the document's purpose is to redirect users to malicious websites.

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/wix?keyword=tamati+waka+nene+gottfried+lindauer
    • https://gipenozup.weebly.com/uploads/1/3/1/0/131070487/0405cdb51.pdf
    • https://cdn.sqhk.co/wadupaxi/ii24hdZ/retrograde_september_2020_capricorn.pdf
    • https://pesawuzopedeg.weebly.com/uploads/1/3/5/3/135327269/63ace.pdf
    • https://bitusuverutito.weebly.com/uploads/1/3/1/8/131871453/e03b647954.pdf
    • http://all-casino.xyz/maths_worksheets_year_7_nzbkh5e.pdf
    • http://spoonnumberone.xyz/nba_2k13_trke_yama_indir_gezginlerdjurd.pdf
    • https://cdn.sqhk.co/rukokota/fgcjcty/16792670825.pdf
    • https://xogefuvoza.weebly.com/uploads/1/3/2/3/132303221/mirogifugo.pdf
    • http://yozi.store/66603957269vlirb.pdf
    • https://fezapatinegu.weebly.com/uploads/1/3/4/2/134266508/fugurozizevadunisum.pdf
    • https://tikobivit.weebly.com/uploads/1/3/1/3/131382680/f9672a5ccab9.pdf
    • http://cleaner360.shop/zibep6yl72.pdf
    • https://fosobezi.weebly.com/uploads/1/3/4/8/134898374/0429b8399.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xazarujokemus/clear_browsing_history_on_android_phone.pdf
    • https://s3.amazonaws.com/kudufigunabi/22167510705.pdf
    • https://s3.amazonaws.com/mozirolinitaje/rpg_maker_mv_free_full_version.pdf
    • https://s3.amazonaws.com/vonutavekip/android_auto_screen_brightness_app.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f023.bin
2bee575673c0a9045e33428ae18bc18ec5b2ec6954b1b96d228456cddc2c8ca9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF023 5152 bytes
font_01_sfnt_off000101af.bin
165519e55a18cb5f6a70905ed531f131b4d5ed9c4868d36eab35c491818fbd63
pdf-font-stream PDF embedded font (sfnt) at offset 0x101AF 10680 bytes