Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ef91951b115cb9d…

MALICIOUS

PDF

82.6 KB Created: 2021-05-27 08:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3898314ab32f0fd68a6680783faa984b SHA-1: 21cfa4f02df75c7ec37103a17bd947bc86bccc67 SHA-256: 7ef91951b115cb9dce08a568aa413812391e832ed5a0b4b3843219ccb1ae14a1
186 Risk Score

Malware Insights

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

The PDF contains a link farm with multiple external URLs, one of which is directly related to downloading game hacks. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/strik?utm_term=sonic+forces+hack+mod+apk+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447903/normal_604f3ba96a995.pdfIn PDF document text
    • https://fukuwere.weebly.com/uploads/1/3/5/3/135395065/aeb51af.pdfIn PDF document text
    • https://bupogoduvokog.weebly.com/uploads/1/3/4/6/134690502/d7a67.pdfIn PDF document text
    • https://liburesaxus.weebly.com/uploads/1/3/4/3/134372769/rifufiwamez-vosakepoganalik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446388/normal_5fedbb1132be0.pdfIn PDF document text
    • https://xadibepewi.weebly.com/uploads/1/3/4/4/134447443/430d544f.pdfIn PDF document text
    • https://navesurupuseg.weebly.com/uploads/1/3/3/9/133997449/gokinidedubi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420934/normal_603687ff3d3c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403556/normal_600e286f68bcd.pdfIn PDF document text
    • https://tarakemutelomul.weebly.com/uploads/1/3/2/3/132303353/zixijawi-muwavog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408330/normal_602be78feea32.pdfIn PDF document text
    • https://tukajolikapuz.weebly.com/uploads/1/3/5/3/135346043/3db8ad.pdfIn PDF document text
    • https://jisuxewaxem.weebly.com/uploads/1/3/1/8/131857679/raragiberej.pdfIn PDF document text
    • https://xudaxeja.weebly.com/uploads/1/3/4/3/134339900/95d8248c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374986/normal_603e50b030566.pdfIn PDF document text
    • https://zukusabaxiwig.weebly.com/uploads/1/3/4/0/134000387/ralixutatopomuxifo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444643/normal_5ff783d37fe03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465388/normal_6018e4b091ec1.pdfIn PDF document text
    • https://xumijarivibamow.weebly.com/uploads/1/3/5/3/135339210/vimimumerem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f81fd1b-2d60-44ff-a404-f43cbee0c6fa/argumentative_essay_introduction_paragraph.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33d7e9ee-990d-437e-a73b-c191a2b3caa5/what_is_an_example_of_central_route_persuasion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83943db6-0787-4e82-a619-40898261f85f/how_much_to_install_garmin_430w.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bee3a39-0f12-4c90-93d1-9d2635665c41/download_corel_videostudio_pro_x9_full_crack_32bit.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_off000101fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FB 5656 bytes
SHA-256: d335af448b43054221a2080f0884d2164c25d0b59c0c32b3886a1cd1490e8bb0
font_01_sfnt_off0001152b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152B 11012 bytes
SHA-256: 6b5a09ba18fc1ad694a3f05c8d302d61c6b124782fd90834bf924404c5c484b2