Malicious PDF — malware analysis report

Static analysis result for SHA-256 4363c38fefbec47a…

MALICIOUS

PDF

74.6 KB Created: 2021-01-26 13:46:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: a03fcdaa06619289950aa8c5eed644c4 SHA-1: fa8e6c158d9dbcb2cfffc32e8be9f688c5b64065 SHA-256: 4363c38fefbec47a2082599bbd091e52873de3bdf45fe0548ff28b9218f8d267
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to .pdf files hosted on various domains, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The document body, though heavily obfuscated, contains text related to 'Sales tax worksheet 5095', which is likely a lure to entice users to click on the embedded malicious links.

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://traffset.ru/123?utm_term=sales+tax+worksheet+5095 PDF link annotation
    • http://leadtop.co/cloudy_urine_pregnancyuw6q9.pdfIn PDF document text
    • http://detonic-ro.website/mewed_noun_synonymvchr8.pdfIn PDF document text
    • http://nekretnine.site/western_gun_sound_effectstyj4r.pdfIn PDF document text
    • https://pemiliruvobavex.weebly.com/uploads/1/3/0/7/130739389/wamulijebibuxe.pdfIn PDF document text
    • http://kewisanoxiv.66ghz.com/fijipotirikalizuza.pdfIn PDF document text
    • https://basedupapopulow.weebly.com/uploads/1/3/4/3/134344364/veraz.pdfIn PDF document text
    • http://italiabeach.space/kill_shot_virus_game_downloadgzmdm.pdfIn PDF document text
    • https://retetozatinum.weebly.com/uploads/1/3/0/7/130775023/3837690.pdfIn PDF document text
    • http://fojozefamofu.22web.org/3d_video_hd_1080p.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mibofive.epizy.com/rurovatevawasigape.pdfIn PDF document text
    • http://puwojewemuxa.epizy.com/vusezaxesufapibadal.pdfIn PDF document text
    • http://rewejuvozotu.epizy.com/camino_de_santiago_trail_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/xunebo.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/bass_booster_hack_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/saripixakogo.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/80856051119.pdfIn PDF document text
    • http://beturatigamoli.epizy.com/39152408987.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/free_party_invitation_templates_australia.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/very_cute_baby_whatsapp_status_video.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_off0000e5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AA 5520 bytes
SHA-256: f6b1a2378c3b47e71e38601da39a5028983c18fe69b35c67a65678928bd790b8
font_01_sfnt_off0000f878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF878 10692 bytes
SHA-256: 3c07af2ac8be8f42d8b876ab66d30cc74ae03659fce4e124897916218c07c93f

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