Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a5037be08c41fc…

MALICIOUS

PDF

82.7 KB Created: 2021-04-12 15:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4884c40463d2652ed7b2a9acb2d062a5 SHA-1: 76f70511cd8021fed3fbad47fc192b21e261682a SHA-256: a7a5037be08c41fc2fd9232219a28e4f3e7aa0fe5d486b6765a1ed3be2d73730
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicated by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a malicious document, likely a spearphishing attachment, designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/strik?utm_term=interior+design+game+apps+for+iphone
    • https://cdn.sqhk.co/xalurubizud/L6qjh9L/wechat_pay_in_us.pdf
    • http://lbaranaydin.com/34_851dhxw.pdf
    • http://govusinixarimi.iblogger.org/49925688953.pdf
    • https://cdn.sqhk.co/jogujufuza/gchjuih/motodebogawonomokizunelu.pdf
    • https://fotizewuzawefuv.weebly.com/uploads/1/3/4/6/134668380/vazibekalasizemo.pdf
    • http://rozefuzapotor.iblogger.org/paxeben.pdf
    • http://stnold.com/how_many_members_of_the_100_person_senate_are_needed_for_a_quorumt2mor.pdf
    • https://cdn.sqhk.co/siwowoso/6hhieyr/poland_president_election_2020_results.pdf
    • http://crysety.xyz/optiplex_755_specs_64_bitp69ta.pdf
    • http://copyrightsupportforlnstagram.com/vilulutisowegejew2xh5.pdf
    • https://cdn.sqhk.co/zizenozi/kThiiiE/73452037098.pdf
    • http://nanukokopetip.iblogger.org/the_disaster_artist_trailer_song.pdf
    • http://muldwych.com/1_11_4_pulgadas_a_milimetrosyykn0.pdf
    • http://wutoxurusot.iblogger.org/mufivodagevivaxalinenu.pdf
    • https://jujodupif.weebly.com/uploads/1/3/2/3/132303189/mixegozu.pdf
    • https://cdn.sqhk.co/bukoxomule/foidjaH/xasilo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bipovoromoj/zokew.pdf
    • http://tafoboverel.epizy.com/10546898787.pdf
    • https://s3.amazonaws.com/purufiz/38809542513.pdf
    • https://s3.amazonaws.com/dinilederu/iomega_storcenter_ix4-200d_software.pdf
    • https://s3.amazonaws.com/xuzed/apply_b_form_nadra.pdf
    • https://s3.amazonaws.com/zikeko/hypercalcaemia_endocrine_guidelines.pdf
    • https://s3.amazonaws.com/sasufufa/cognos_analytics_dashboard_format_percentage.pdf
    • https://s3.amazonaws.com/ruzaganog/twilight_saga_breaking_dawn_part_1_movie_download_in_hindi_720p.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010455.bin
7ec7c814e652b6057c09a00f5ebc43397846ba92b5ac4831d042a7820d5c6c17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10455 5360 bytes
font_01_sfnt_off00011666.bin
ea91cf3a06eb2229c4d65718950c42ac0a6340d14dcbaf9b2e091f74e43bb668		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11666 10792 bytes

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