Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c32d614b00cecdd…

MALICIOUS

PDF

76.2 KB Created: 2021-01-29 07:10:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: aa31316fa94dd023642ad7e4e03ac45f SHA-1: 7bbeeab52deba2d227e716e536313de8760d36e4 SHA-256: 4c32d614b00cecdd5eec52e0216dd8a190c31b988d601389eed064fbc58ac2de
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to seemingly benign S3 buckets, but also includes a suspicious link to 'seumenha.ru' disguised with a 'baby games for pc' term. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO link farming to drive traffic to malicious sites. No scripts were extracted, but the PDF structure itself is used to host and present these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/aws?utm_term=baby+games++for+pc PDF link annotation
    • https://nulivuxod.weebly.com/uploads/1/3/0/7/130776854/sekoxur_xevoxubipatud_mupadup_vexovisapivobaj.pdfIn PDF document text
    • http://naykaryadom.fun/o_grave_robber_minelluje.pdfIn PDF document text
    • http://kprovk.xyz/4_pics_1_word_level_3372u5qyy.pdfIn PDF document text
    • https://napolapivu.weebly.com/uploads/1/3/5/3/135303388/8cc795e9.pdfIn PDF document text
    • https://gagegopered.weebly.com/uploads/1/3/4/8/134880179/gutetu.pdfIn PDF document text
    • https://dodapoxole.weebly.com/uploads/1/3/1/3/131398067/0095ebd43bb.pdfIn PDF document text
    • http://dimax.website/total_war_warhammer_2_traits_guidebzwkt.pdfIn PDF document text
    • https://dagakaxogofawi.weebly.com/uploads/1/3/4/6/134699425/fodaliv.pdfIn PDF document text
    • http://carbags.site/labyrinth_castle_rock_covx9eh.pdfIn PDF document text
    • https://mimevomakiket.weebly.com/uploads/1/3/4/6/134693464/tidulitufufegusaxovi.pdfIn PDF document text
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/raven-gutule-durumotufapixu.pdfIn PDF document text
    • http://itdomen.fun/warm_bodies_full_movie_with_malay_subtitlesterwb.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/rabewiruzitewa/university_of_waterloo_campus_map.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/lesulixonisenefupib.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/44071768185.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/76253015497.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/captain_underpants_games_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/58270500452.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/3d_animation_for_powerpoint_free.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/kupil.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/curriculum_guide_in_esp.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/amumu_jungle_guide_season_9.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_off0000eb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB94 5596 bytes
SHA-256: 643e2e2c05a3842bbbcaf5ef7d01c12d1fed9957447f2c1a5376e22b15ef95e6
font_01_sfnt_off0000fe94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE94 10768 bytes
SHA-256: e1afad5716ee0ae7cae9bd555a5c06ba4c4792e9fc31ca36aac36b0b07690a20

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