Malicious PDF — malware analysis report

Static analysis result for SHA-256 84af781ccf3d6d72…

MALICIOUS

PDF

68.2 KB Created: 2021-05-17 13:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e93460bb448accb6df3b408a31951ed8 SHA-1: d5c20fc25e0e69ba69ec2107066fb4d81ad9e8f1 SHA-256: 84af781ccf3d6d723b531bbdcad2bb4370b03b0c714e41b594a608d4c25dc742
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are structured as a link farm, suggesting an attempt to drive traffic to other sites. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be related to marketing PDFs, likely a lure to disguise the malicious nature of the embedded links.

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://resalured.ru/strik?utm_term=fundamentos+de+marketing+pdf+philip+kotler
    • https://cdn.sqhk.co/sawomunuj/0J9ijQW/72757170523.pdf
    • https://cdn.sqhk.co/gujowaxexag/bOtibje/89330119421.pdf
    • https://cdn.sqhk.co/kakapoxavu/3jhQUie/drill_evolution_mod_apk_unlimited_money_and_gems.pdf
    • https://cdn.sqhk.co/xolofiwano/hfxjcjt/xodumawa.pdf
    • https://foxejakepi.weebly.com/uploads/1/3/0/8/130874264/7773557.pdf
    • https://cdn.sqhk.co/zavufepugife/ghjjFib/sling_tv_app_samsung.pdf
    • https://cdn.sqhk.co/sovajepuxe/jcvifI5/beard_trimmer_amazon.pdf
    • https://setuzenizenu.weebly.com/uploads/1/3/5/9/135973655/nojiratup.pdf
    • https://cdn.sqhk.co/jogowijalaro/hjZIeii/27412986203.pdf
    • https://cdn.sqhk.co/tamejenonisi/dgM1haW/tugomarureruxilopepusof.pdf
    • https://cdn.sqhk.co/piwuzuberaze/phhjcfz/2017_football_rookie_cards.pdf
    • https://cdn.sqhk.co/poxofufiko/ii9he2R/dinosaur_simulator_value_list_docs.pdf
    • http://mifirejetevina.getenjoyment.net/zunuziko.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e8b83640-91e4-44a0-a69f-c2468797902f.filesusr.com/ugd/ee4a13_a7624ce4ae134360b14a188678a3aeab.pdf?index=true
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_09301e9a39df4f8eb197a5d7e5889a65.pdf?index=true
    • http://kepofif.onlinewebshop.net/70881459371.pdf
    • https://uploads.strikinglycdn.com/files/8b6c2e85-0ca3-40e8-bc11-eb4819b6f119/3012969121.pdf
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_5999417a8db24e93a66e85495211d511.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4d33b496-2f1d-49a0-908e-d3b8ad04dd50/manual_de_funciones_de_una_empresa_industrial.pdf
    • https://uploads.strikinglycdn.com/files/d637f4d4-0d9a-48fc-8716-cf7ee958f2ea/wegufijogidat.pdf
    • https://uploads.strikinglycdn.com/files/b0d81100-4252-4d2f-b95a-4a38bf4050e4/pefibugopinej.pdf
    • https://9e9203d9-9f5b-42f2-a849-05e42d741f90.filesusr.com/ugd/3527d5_f59a33b8c63a4c90a092024bd8ab9171.pdf?index=true
    • https://27475d5a-2981-497d-8cd5-0c310ef10f8b.filesusr.com/ugd/9cb927_28463e01b51f48bbac31cc0bfe527c44.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_off0000cbc5.bin
a94ad1054c69031149ac618c302348d04bb0726b802a63984f36cd324f5d206c
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC5 5472 bytes
font_01_sfnt_off0000de3a.bin
5be7922083b10e0dea4157a7a6b2730d73978aa5898b9248c8ec96c0c378d8f9
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3A 11172 bytes