Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc314b906d9a4c4d…

MALICIOUS

PDF

79.8 KB Created: 2021-02-16 11:47:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: e3f986cbf3895b98acf4a04824c9b55e SHA-1: fa0252f47ee5ebad4550a5cbb758da26a4d35749 SHA-256: dc314b906d9a4c4d5229ffc952143480745d95f62932fbe1543a0ac876d10ac4
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 of which point to suspicious domains and are likely part of a link farm designed to distribute malware or phish for credentials. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://seumenha.ru/123?utm_term=statistics+and+probability+calculator PDF link annotation
    • http://rbqjkwklnd.xyz/11329375187rok8r.pdfIn PDF document text
    • http://zelopaqq.xyz/zurugadoxozaluo6etr.pdfIn PDF document text
    • https://dexekuweda.weebly.com/uploads/1/3/4/7/134705305/basomogebixej.pdfIn PDF document text
    • http://discount50.pro/neck_check_thyroid_gland3cid9.pdfIn PDF document text
    • https://jedurabononip.weebly.com/uploads/1/3/1/4/131453193/24040575ff65c.pdfIn PDF document text
    • https://lapidarofo.weebly.com/uploads/1/3/0/8/130874394/ketal_kamup_nazapax.pdfIn PDF document text
    • http://reduslimitalia.site/monday_takeout_specials_near_meeoe52.pdfIn PDF document text
    • http://tehnotop.site/kark_seme_trkler_40_adet_mzikc2yzh.pdfIn PDF document text
    • https://cdn.sqhk.co/mufipofunup/hBicGw1/sikuvujosubemabidaguz.pdfIn PDF document text
    • http://agreevudb.rest/myrkur_house_carpenter_lyrics_meaning1k6sh.pdfIn PDF document text
    • https://kelobutino.weebly.com/uploads/1/3/0/9/130969458/c8a26faf1d6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/indian_accounting_standards_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/kilomezuxometemebet.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/99910400941.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/worksheet_body_beast.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/dometic_capacitive_touch_thermostat_user_s_guide.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24F 5412 bytes
SHA-256: bc4b623a66a2e5d44dcd7e5516b370262833bc4a54a9d8d452a4072a0bffe2e5
font_01_sfnt_off0000f4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BA 11932 bytes
SHA-256: 4d399b5098642783f28c6be776b5f17d1f117513148ba521e3d627ffe6ce1152
font_02_sfnt_off00011c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C87 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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