Malicious PDF — malware analysis report

Static analysis result for SHA-256 6427ed31361bdd61…

MALICIOUS

PDF

73.0 KB Created: 2021-04-20 22:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 860f1248243c69249dc2175505b1b25a SHA-1: 364c9a67663fc449d2c237864f38406a3f4868b9 SHA-256: 6427ed31361bdd61fdf1207ea61b938cae8d9ca32f8b5974e8f4b63fc99b30c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, flagged as a 'PDF_SEO_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS'. The ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly suggests a phishing or trojanized document. The embedded URLs are likely used to redirect users to malicious sites for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=how+to+replace+samsung+s5+charging+port
    • https://cdn.sqhk.co/vulovosovem/ejajbig/war_of_the_zombie_money_cheat.pdf
    • https://cdn.sqhk.co/durotula/Uijghhh/lifetime_maximum_care_warranty.pdf
    • https://tulivugid.weebly.com/uploads/1/3/4/6/134607321/gomogoka_wugerurusazo.pdf
    • https://cdn.sqhk.co/pefisemise/hjgdihb/scary_movies_coming_out_in_december_2020.pdf
    • https://cdn.sqhk.co/tiruxugajo/Wia23B2/wurezugefikabaz.pdf
    • https://cdn.sqhk.co/botuvawezej/0ljbS4x/coffin_nails_short_french_tip.pdf
    • https://cdn.sqhk.co/nixibaraje/6gfidjf/pixel_racer_hack_ios.pdf
    • https://bubebozozuj.weebly.com/uploads/1/3/1/8/131871643/retodanepogunanut.pdf
    • https://zomoxiwoginu.weebly.com/uploads/1/3/1/6/131637743/kidejugexaxejal-demakesesatinu-zifena.pdf
    • https://cdn.sqhk.co/wotutovebo/fgehjgj/buy_sell_comics_near_me.pdf
    • https://cdn.sqhk.co/wudenedu/BxCjho5/orange_tree_resort_paradise_valley.pdf
    • https://vibisorimujeke.weebly.com/uploads/1/3/4/3/134344086/kerisatasufuz_nuxowulip_depepejefo.pdf
    • http://lesitegu.iblogger.org/12236384005.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/geradi/girlfriend_bengali_movie_filmywap.pdf
    • http://gulalebiton.epizy.com/raintree_homeowners_association_goldsboro_nc.pdf
    • http://fiwemigusa.rf.gd/40057018910.pdf
    • https://s3.amazonaws.com/bisiku/bogurexonuk.pdf
    • https://s3.amazonaws.com/kisimujuk/99292316969.pdf
    • https://s3.amazonaws.com/bepukuba/vivopobolusawozakolajow.pdf
    • https://s3.amazonaws.com/vukusa/72133240386.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_off0000dce7.bin
09945d1079f5d99c92a1ba5259febd7cabcedd4cf7442225c7abc7059805adec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE7 5524 bytes
font_01_sfnt_off0000ef99.bin
182c46ff00c516e4bc8697003ac9b3cbc98bc345dbc3f1e0505c556d8838c95b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF99 11028 bytes

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