Malicious PDF — malware analysis report

Static analysis result for SHA-256 778fcb30cafd0d50…

MALICIOUS

PDF

90.0 KB Created: 2021-03-26 10:17:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb7befd73ab5a7aa83696bc3c23a9838 SHA-1: 166f4906e2668f937d22e8b16b92eac0cfbf98cd SHA-256: 778fcb30cafd0d509d68113df5e26b8ef7cebc022ff3a84e3cb36718097fa0e1
156 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which are likely part of an SEO spam or link farm operation. The primary URL, 'https://jottigo.ru/award?keyword=stoner+john+williams+pdf+italiano', suggests a lure to a website disguised as a search result. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/award?keyword=stoner+john+williams+pdf+italiano
    • https://famosufed.weebly.com/uploads/1/3/4/9/134900490/dosuzojofovenil_betatebudab_dogodezulis.pdf
    • https://cdn.sqhk.co/pimibopugugo/ibdjjie/dragon_ball_super_trading_card_game_rarity.pdf
    • https://cdn.sqhk.co/moserusoba/hfhczhc/78895116460.pdf
    • https://cdn.sqhk.co/duputokodoz/jv3jbP5/buvijemutewolutigev.pdf
    • https://cdn.sqhk.co/gojapawareke/hcYSgeG/35908127421.pdf
    • https://cdn.sqhk.co/rivogigaweb/mH9mgiL/super_jump_soccer.pdf
    • https://levevuwakute.weebly.com/uploads/1/3/4/9/134904524/5002520.pdf
    • https://nujatorub.weebly.com/uploads/1/3/1/8/131858108/difexo.pdf
    • https://kevititexozasen.weebly.com/uploads/1/3/2/7/132712545/vosadevi.pdf
    • https://wunopavowar.weebly.com/uploads/1/3/4/6/134660490/4676134.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xefejevife/fortnite_season_5_week_5_challenges_guide.pdf
    • https://uploads.strikinglycdn.com/files/a740a046-ea73-463d-87d8-cb4e9c7cc012/the_things_they_carried_essay_topics.pdf
    • https://s3.amazonaws.com/vavale/beponogoniguzagawuredogag.pdf
    • https://s3.amazonaws.com/tiniruru/52044841440.pdf
    • https://uploads.strikinglycdn.com/files/0697a376-3616-4330-bb9a-5e2574fdea90/mopikoraro.pdf
    • https://46fb9a51-9e16-4ad8-811e-2f7ed01702f7.filesusr.com/ugd/53363c_e2d3fbb78f044576ac453cbe8a240a90.pdf?index=true
    • https://c7e723d0-7712-45a3-a8dd-8d8935e7c5e2.filesusr.com/ugd/c4f451_786a2a476d754fa1b7c9163cea2c05a2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b0fb5919-b7be-4144-a04e-7edeacd3a484/how_much_do_lotus_cars_cost.pdf
    • https://uploads.strikinglycdn.com/files/780c6d76-404c-4a2b-9f6d-878cf8ce509a/what_happened_in_the_us_in_1910.pdf
    • https://uploads.strikinglycdn.com/files/1e4c8d6c-9545-4636-b36d-46e349175e9d/59119937952.pdf
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_a7dc2f29f12f4fff8e98fee5a65f859c.pdf?index=true
    • https://724418e0-3ace-43c1-abd8-628b4820fc71.filesusr.com/ugd/6df952_1d1ff025daca43b5b02ecb2d9e60c880.pdf?index=true
    • 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_off00011d58.bin
1d0107fc29a6596aed20a065100f064d003a1be9f33a3c4cb6c7b97688e59165		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D58 5552 bytes
font_01_sfnt_off00013028.bin
9b8f85dfe9a5917370a9f73f6b6844e187f18c692dcf3979c87e501f4b7ca44f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13028 12612 bytes

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