Malicious PDF — malware analysis report

Static analysis result for SHA-256 57e6821aa3fc103e…

MALICIOUS

PDF

91.7 KB Created: 2021-05-10 07:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7a8f550acd46df8b39ffd3ffaaa2af5b SHA-1: c12158cbe66cec8e9fbc27269dacdc6b27db300d SHA-256: 57e6821aa3fc103edfb10bc42f5986f5eb9bf8c81328b9e683739ef8d90aa660
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to leverage embedded content or JavaScript to facilitate malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=is+jack+and+the+beanstalk+on+netflix PDF link annotation
    • http://trells.space/sbl_examiner_report_september_2018o2gqj.pdfIn PDF document text
    • https://cdn.sqhk.co/jasowipe/mFhe0VD/dodatemezuvokozo.pdfIn PDF document text
    • https://cdn.sqhk.co/bipadifudame/iaYlihk/telegram_x__windows_7.pdfIn PDF document text
    • http://cashbackmoney.info/dajapujiwokomenst1qx.pdfIn PDF document text
    • https://cdn.sqhk.co/wanoposuj/jagiig1/gin_rummy_plus_coin_cheat.pdfIn PDF document text
    • http://bluebadge-support.com/7703396486k468a.pdfIn PDF document text
    • https://nililuwuta.weebly.com/uploads/1/3/0/7/130775375/sopopelubefo-jozovudi-mabuxegafoz-bovutober.pdfIn PDF document text
    • https://cdn.sqhk.co/kugorazig/eRji5qS/reposteria_definicion_segun_autores.pdfIn PDF document text
    • https://cdn.sqhk.co/nejisakatok/cjdTO0U/godex.pdfIn PDF document text
    • http://stav-games.ru/kyocera_duraforce_pro_manual_verizonm77pn.pdfIn PDF document text
    • http://creditinquiry.info/426935239634ywoy.pdfIn PDF document text
    • https://pojejuxafofivev.weebly.com/uploads/1/3/1/3/131398022/dowulinixeneg_jedufifegi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6739ca04-605d-4ff4-b4c9-4e5bd75a7819.filesusr.com/ugd/031dda_6ec3d023e91b413b94134c7855614404.pdf?index=trueIn PDF document text
    • https://5e54824a-8208-41b0-8aeb-7c017e8cfb46.filesusr.com/ugd/f64db8_d64176f79a704cdea4164ce587035191.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/59f22924-c101-4620-9398-7d2825398b0f/fasaput.pdfIn PDF document text
    • https://7fad2989-91b8-457c-89bc-9a0e7aeef19f.filesusr.com/ugd/b03ff3_551c2efdbfc0450ba7937511426ca251.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/13e22230-c313-49e4-9f45-89c6d460b996/hp_scanjet_5590_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72f50c44-3cd6-4d18-9de9-83c64a615e45/android_development_tutorial_javatpoint.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df721b5e-74bf-4616-a61f-cac424080db7/wapujin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d51ac48-3b59-4fb5-b93d-179500991e5a/alimentos_y_bebidas_que_los_contienen_las_frutas_y_verduras.pdfIn PDF document text
    • https://eac5c218-d238-408c-98a6-8ff0ecbb25fc.filesusr.com/ugd/b1277d_09fd43e78ebb4b4baf466204d7b06494.pdf?index=trueIn PDF document text
    • https://c31d65df-273c-4bcc-acfb-7b03b0724b99.filesusr.com/ugd/e7e4a0_a610334d497d479584b3db5c94572d65.pdf?index=trueIn 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_off00012909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12909 5296 bytes
SHA-256: 8bcc5fee67961894914385f16815382615766b862a042f72618b43ff8b23095b
font_01_sfnt_off00013b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B18 11336 bytes
SHA-256: 63f054e0ac0b750bbe0bda0115dd008c1739c1c18f8a30c6dc00a9ecf7b5f736