Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b81bf726471cda7…

MALICIOUS

PDF

71.5 KB Created: 2021-03-19 21:42:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df3aabe3ad51ed4bcf582deaeae695c9 SHA-1: d03166bafa22f13ce5c5e99409bf93794f989fe9 SHA-256: 7b81bf726471cda72561e3b241f94f77d4f1efa43a5a9bbefa5368097b8ac656
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV and an ML classifier as malicious, specifically as a phishing trojan. Heuristics indicate a large number of external links, with the primary one pointing to 'nasty666.space', suggesting a link farm designed to redirect users to malicious content. While no scripts were directly extracted, the PDF structure and numerous external links strongly imply an attempt to lead the user to a compromised or malicious site.

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 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://zajinet.ru/strik?utm_term=amar+chitra+katha+books+amazon PDF link annotation
    • http://nasty666.space/wenazapepafisevaxobujamepdyt7.pdfIn PDF document text
    • http://datingdate.site/overhead_door_legacy_model_696cd_b_manualuexih.pdfIn PDF document text
    • http://gagefiwirimat.medianewsonline.com/58383698198.pdfIn PDF document text
    • http://cashbackmoney.info/54381391229nsyg1.pdfIn PDF document text
    • http://mugedly.xyz/zupuvebezogodiwinopiz7wu2b.pdfIn PDF document text
    • http://p-kavkaza.ru/87097459026j9ssk.pdfIn PDF document text
    • http://lulopoboxefon.scienceontheweb.net/asus_rt-ac66u_a1_aimesh.pdfIn PDF document text
    • http://itawomen.fun/2009_challenger_rt_performance_parts4hw7q.pdfIn PDF document text
    • http://boforotaje.mywebcommunity.org/jojabedowetisezipi.pdfIn PDF document text
    • http://frasqen.online/state_absentee_ballot_request_form_north_carolina0ikb1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://65de77fc-0341-4fd2-89b2-cd6b005a91de.filesusr.com/ugd/cf79db_db0326e6ac1047aa99f0780cb26e6bcb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/divikufifir/83970120861.pdfIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/relifibetogel.pdfIn PDF document text
    • https://e5447efa-8854-4d04-834e-f0bbd7438c8b.filesusr.com/ugd/ac612b_0198510db76f419ab96c500a88840312.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bofake/jilizedakasukoluvedu.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/us_portal_docket_sheets_pa.pdfIn PDF document text
    • http://vidugozu.atwebpages.com/alif_novel_episode_1_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/circular_motion_class_11_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/how_to_find_the_volume_of_a_cuboid_without_the_length.pdfIn PDF document text
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_e82eff04fd45424280c0d328cfa8db27.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/beyno_font_black_panther_free.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_off0000dc59.bin
8ca08fed2bfd256e941903c859c469033e803fcd5508c1686dc18f724f9e92ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC59 5248 bytes
font_01_sfnt_off0000ee08.bin
c40bbba9a257f13c044f903d90ae4f85b6ba1fd10a7d5927c9a95b0d16709648		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE08 10188 bytes

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