Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b513b64ecd70585…

MALICIOUS

PDF

76.8 KB Created: 2021-03-08 10:54:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 22fd666e6fabd0fded2bb9083ef159d2 SHA-1: a75833c14f29049a15cf0f6d106795246793043d SHA-256: 5b513b64ecd7058508fc5c378064430a071c93263b96e02f2ea0622c938573d7
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The document body, though heavily obfuscated, contains text related to free PDF downloads, suggesting a lure. The presence of numerous external URIs, many hosted on disposable domains or link farms, further supports a phishing or malicious download attempt. No scripts were extracted, but the PDF structure and external links are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://xajibur.ru/award?keyword=macro+perspective+of+tourism+and+hospitality+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/vasinabew/jbxydjj/cruise_america_denver_phone_number.pdfIn PDF document text
    • http://winoorama.website/6759306155819t9l.pdfIn PDF document text
    • http://kedugobepuged.mywebcommunity.org/asus_rt-n66u_firmware_alternative.pdfIn PDF document text
    • http://xibipumazanepir.iblogger.org/66096674671.pdfIn PDF document text
    • http://liwojabegeje.iblogger.org/48975002515.pdfIn PDF document text
    • https://cdn.sqhk.co/modonasuje/EbgijPg/19281126518.pdfIn PDF document text
    • https://cdn.sqhk.co/bomaguvodar/tLegcD5/nezadelidagod.pdfIn PDF document text
    • https://cdn.sqhk.co/damukowabij/Dgjvzja/hit_tha_roof_speed_gang_traduction.pdfIn PDF document text
    • http://parazepurafeza.medianewsonline.com/mikos.pdfIn PDF document text
    • http://ionatr.space/what_are_some_environmental_issues_in_south_americaek9ju.pdfIn PDF document text
    • http://vuwefedope.sportsontheweb.net/mipubovoli.pdfIn PDF document text
    • https://cdn.sqhk.co/xanuramalu/sHgcR0I/xowuwito.pdfIn PDF document text
    • http://lovumodezubudem.iblogger.org/chori_chori_movie_video_song.pdfIn PDF document text
    • http://copyright-central-media.com/50821240249l2znw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bajipodi.epizy.com/xamarin_forms_entry_binding.pdfIn PDF document text
    • http://pawekixezad.epizy.com/43343839458.pdfIn PDF document text
    • http://vekabun.myartsonline.com/65606912413.pdfIn PDF document text
    • http://najovuwovi.rf.gd/39330897754.pdfIn PDF document text
    • http://wawuzir.epizy.com/gaxemiduborelavewuke.pdfIn PDF document text
    • http://faripemisale.rf.gd/54540583683.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_off0000ef50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF50 5652 bytes
SHA-256: cdf9cc910ea45271dbae971c6d7e9b7dbd071273f852c962e8d6bab3dbebea65
font_01_sfnt_off00010286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10286 10360 bytes
SHA-256: 20882f9d951ef1e5423b8e1fa25c7160f6d2b829de952ebf3de92c15731332dc

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