Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d6292fdae21fe65…

MALICIOUS

PDF

94.4 KB Created: 2021-03-23 23:44:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1a052d2ee44e7ac52bc3c951d1ee0d07 SHA-1: 776d03047e498960471a08698e71f9181b3d7862 SHA-256: 4d6292fdae21fe652c511e8cf7a6d27878dc423a9f301a7f84d0e6bcb35b3bfb
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm for SEO manipulation or to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards an attempt to redirect users to malicious sites, potentially leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/award?keyword=urticaria+cronica+autoinmune+pdf PDF link annotation
    • http://gisoboxizaza.mygamesonline.org/daromibugijaz.pdfIn PDF document text
    • http://bomepufibawil.scienceontheweb.net/99580176238.pdfIn PDF document text
    • https://wubinuju.weebly.com/uploads/1/3/4/6/134642725/dijemavegorepalikufi.pdfIn PDF document text
    • http://fosipuzo.mypressonline.com/9163887117.pdfIn PDF document text
    • http://tetizeniwa.mypressonline.com/nuclear_energy_advantages_and_disadvantages.pdfIn PDF document text
    • http://delinapod.mypressonline.com/healthrider_h90t_treadmill_review.pdfIn PDF document text
    • http://diporesorojina.scienceontheweb.net/add_monster_cards.pdfIn PDF document text
    • https://lisobigu.weebly.com/uploads/1/3/1/6/131606175/ce5ba2293984.pdfIn PDF document text
    • http://titanof-filtr.ru/google_finance_formulas_list2r9rx.pdfIn PDF document text
    • http://choosemadam.site/actividades_interactivas_tabla_periodica_de_los_elementos_quimicos6z0j5.pdfIn PDF document text
    • https://bisofojud.weebly.com/uploads/1/3/1/6/131607445/votuwusobal-lusejekifobe-fujisinav-bukirixopebi.pdfIn PDF document text
    • http://ita-talia.fun/best_childrens_illustrated_dictionary4cwbw.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wasaxotudulolo.epizy.com/weather_report_paris_14_days.pdfIn PDF document text
    • https://a50dbba5-e4fd-40cc-afa9-a45495a5accf.filesusr.com/ugd/7f929b_fd4eb622a25e4b90b30eae60aef402b7.pdf?index=trueIn PDF document text
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_693c4c25c45e4ff095d94be852707d8b.pdf?index=trueIn PDF document text
    • https://70848fb0-0fd0-490a-9360-2ffa38fc212c.filesusr.com/ugd/08e331_aabd708aace34effa0cd56f810b3e334.pdf?index=trueIn PDF document text
    • http://wasupudunufol.rf.gd/11270136560.pdfIn PDF document text
    • http://sewuxuta.rf.gd/14936740278.pdfIn PDF document text
    • https://4ef57e19-9a2e-4e6f-a444-f6b59f982a39.filesusr.com/ugd/4c1554_9a9a5c0e659a4fc1b54bc86602c19d68.pdf?index=trueIn PDF document text
    • https://91c7bc9f-df77-4dbd-ae51-8bcf521f3e61.filesusr.com/ugd/1df9ea_8141833b21c54453a41cea1de166af3d.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000129a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A3 1644 bytes
SHA-256: c4d1a53d937dc80cc27e4df479f32ca6cbda414fa749da358494056b5d309486
font_01_sfnt_off000131d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D2 5080 bytes
SHA-256: 573ce52a4f49d6791797935213e9789817011cae54024899bb8c3f973c114251
font_02_sfnt_off00014308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14308 12172 bytes
SHA-256: b3197ae1aef9ffdcc64c913c1b60e79a52ede84abee7c6a6487e51896afd3296