Malicious PDF — malware analysis report

Static analysis result for SHA-256 33bb51c7b6b7cc5d…

MALICIOUS

PDF

65.6 KB Created: 2021-02-10 04:06:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 94c04f1835b9fdd748328ede1461993d SHA-1: 339f6f34f69547405fd3255271bd805fea5e1992 SHA-256: 33bb51c7b6b7cc5d160f7a5797d248e8e54b1d1b85cf92a69cb3ced3134bb1f5
124 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of PDF_URI and EMBEDDED_URL heuristics further supports the attack pattern of directing users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8125

Heuristics 4

  • 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 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
  • 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://maypoin.ru/aws?utm_term=rubber+stamp+maker+free
    • http://vunekopewode.22web.org/ethiopia_reporter_news_paper_amharic.pdf
    • http://puwuditufu.22web.org/pulse_secure_client_link.pdf
    • http://enots.space/arachnids_and_insects_dichotomous_key_answerssdczn.pdf
    • http://tokio-2020.fun/download_piano_tiles_3_pc0mwa9.pdf
    • http://koolmaxt.online/96490596749jytn4.pdf
    • https://gavokafiwafez.weebly.com/uploads/1/3/1/3/131381231/8614062.pdf
    • http://vizit.store/summoners_war_toah_tier_listoe2ys.pdf
    • http://giocodigital.website/butterball_turkey_fryer_xl_owners_manualdvyu1.pdf
    • https://bisobozewex.weebly.com/uploads/1/3/0/9/130969373/jexuxowikufip.pdf
    • http://cadenalia.com/techcrunch_logo_assets17x38.pdf
    • http://jsexj.fun/delonghi_ec155_repair_manualdenve.pdf
    • http://zhigina.ru/sakura_school_simulator_apk_androiduw9bc.pdf
    • http://istlan.space/pressure_ulcers_treatment_guidelinesovjio.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zefixufedinokas.epizy.com/mejidoxuditofaguv.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd22.bin
c219d7e596599a0e91151ee6d6539fe3ac3d17eacc87c1c1f3e47c69de0fcd30		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD22 5228 bytes

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