Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eab18461fdbded5…

MALICIOUS

PDF

88.1 KB Created: 2021-02-25 15:54:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ab4cdc8f1d39f59ff304aedced8d5934 SHA-1: 7def261bd2a419e8e4c23f88be215674397ad999 SHA-256: 5eab18461fdbded596e86ef86dfc906f6040c4708e975db3520ff3bf864028d3
194 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to various disposable domains under the guise of providing Skyrim mod installation instructions. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of numerous external links, many hosted on disposable domains, reinforces the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bologen.ru/strik?utm_term=skyrim+special+edition+mods+how+to+install PDF link annotation
    • http://xukuvapama.iblogger.org/arinc_429_label_list.pdfIn PDF document text
    • http://power-guard.shop/casio_calculator_watch_change_military_time80c7r.pdfIn PDF document text
    • https://cdn.sqhk.co/samofetob/hb5fmYR/nyx_music_player_pro_apk.pdfIn PDF document text
    • https://zejizatuziw.weebly.com/uploads/1/3/0/7/130739720/jibuj_xosofuwajafad_zefizagunorab_xaresogezewaja.pdfIn PDF document text
    • https://cdn.sqhk.co/zowolanazew/gghhbLT/zavitezagaxotag.pdfIn PDF document text
    • https://cdn.sqhk.co/fujonexa/gjLIEwQ/ben_10_omnitrix_hero_hack_mod_apk.pdfIn PDF document text
    • http://citimart.online/53986683362u8ro4.pdfIn PDF document text
    • http://kittyplay.online/amar_chitra_katha_tamilm69k0.pdfIn PDF document text
    • https://cdn.sqhk.co/bogonelemid/ljbhgjc/soccer_3d_night_light.pdfIn PDF document text
    • http://mkr-olimp.info/85759795434nvd7s.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://liboditi.rf.gd/300054391.pdfIn PDF document text
    • http://mutodilevo.epizy.com/bleeding_love_piano.pdfIn PDF document text
    • http://kowesodi.rf.gd/how_to_trade_options_on_vanguard.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7B 5464 bytes
SHA-256: fea9edb90bf9cfe5f574ffc5fc5a85fe742ec03086be949b7ab81942b191a3ad
font_01_sfnt_off00011fe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE8 10928 bytes
SHA-256: 727298518784106e22056be627b4f9b26637adf176e62049977f669d6151ffb8
font_02_sfnt_off00014533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14533 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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