Malicious PDF — malware analysis report

Static analysis result for SHA-256 f194ef9898f9679a…

MALICIOUS

PDF

71.6 KB Created: 2021-02-16 01:01:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: cb3faf2b71b2f538e6b0fc686dda49ed SHA-1: b6c9657525d002b6ebe87c307bdd1d155e8b16dd SHA-256: f194ef9898f9679a12b15f3372a7b3db91bf76f87a16f522d3e474e12f1b00ee
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 0.9998

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://jottigo.ru/123?utm_term=how+to+pass+leed+ap+exam PDF link annotation
    • https://bexoxofimimiwox.weebly.com/uploads/1/3/0/7/130775405/4011b04f20f1a9.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxiropuwomo/YEFghjb/english_song_lyrics_download.pdfIn PDF document text
    • https://jedadizonavo.weebly.com/uploads/1/3/4/7/134721040/4174593.pdfIn PDF document text
    • https://tasimaxexakopox.weebly.com/uploads/1/3/2/6/132681882/6a893.pdfIn PDF document text
    • https://cdn.sqhk.co/fazituku/ih24Hgd/state_farm_estimate_car_insurance.pdfIn PDF document text
    • https://komibaxes.weebly.com/uploads/1/3/1/6/131606619/06cda124e42c8.pdfIn PDF document text
    • https://litazotivov.weebly.com/uploads/1/3/0/7/130740097/4491067.pdfIn PDF document text
    • https://xugimitedekilim.weebly.com/uploads/1/3/1/4/131482884/4fd558.pdfIn PDF document text
    • https://basedupapopulow.weebly.com/uploads/1/3/4/3/134344364/zarafonejaxepupi.pdfIn PDF document text
    • https://cdn.sqhk.co/gozawelesutu/jahevgd/stick_squad_sniper_battlegrounds_mod_apk_latest_version.pdfIn PDF document text
    • https://cdn.sqhk.co/sejejajoxej/hdhb6hn/99485951425.pdfIn PDF document text
    • https://wegakerovosa.weebly.com/uploads/1/3/0/8/130873826/ce682c6c705ff.pdfIn PDF document text
    • https://wozizagozesa.weebly.com/uploads/1/3/4/8/134848764/ecdf44e35ffa.pdfIn PDF document text
    • https://xafukulirodut.weebly.com/uploads/1/3/1/3/131379356/nokevamebijezukujija.pdfIn PDF document text
    • https://kazajibabagak.weebly.com/uploads/1/3/4/4/134467412/gawudosalan-jirebajezoj-vudid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://valapapiwusujeg.rf.gd/battery_saver_for_iphone_4s_free.pdfIn PDF document text
    • http://serefelotu.epizy.com/nusabet.pdfIn PDF document text
    • http://wevedikelu.epizy.com/beyblade_burst_games_in_mobile.pdfIn PDF document text
    • http://pumejusatojajeg.rf.gd/dovuraxemururuzeged.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_off0000da5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5A 5132 bytes
SHA-256: c8bbb91aefd89efeb6b3be93c40da7ed362ad76be2ee2e5cf9614cf8bcdb8f54
font_01_sfnt_off0000ebcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCB 11076 bytes
SHA-256: e09373a0c2de5729d97e23f6f70b9e38a38d32164d794632bcca11ec4be4f3dc

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