Malicious PDF — malware analysis report

Static analysis result for SHA-256 78038d013292cf44…

MALICIOUS

PDF

83.0 KB Created: 2021-04-23 17:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6377cf2e9ba6f54f7d7f65e09e2853a7 SHA-1: 2a72f3de41e20dafa60fc6a0a8b7d823689e938e SHA-256: 78038d013292cf44115fc15ea44b0211edd42cbb1d93c967f2f1a6c4a2812b5e
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are characteristic of phishing lures designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://mezovuduw.ru/strik?utm_term=how+to+calculate+real+gdp+deflator PDF link annotation
    • http://socialwave.me/kujematotujibumegimomabavso2yi.pdfIn PDF document text
    • https://jileninaniwepuz.weebly.com/uploads/1/3/4/7/134771173/8d2f4d9911c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460450/normal_60342003ccb93.pdfIn PDF document text
    • http://picply.ru/administracion_de_medicamentos_pediatriagfk9l.pdfIn PDF document text
    • https://bipilebel.weebly.com/uploads/1/3/1/6/131606150/8920634.pdfIn PDF document text
    • http://vipadminler.org/logical_reasoning_questionsm8kac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418197/normal_60418b0932f3e.pdfIn PDF document text
    • https://semulojera.weebly.com/uploads/1/3/2/6/132695334/042b02.pdfIn PDF document text
    • https://guwakeba.weebly.com/uploads/1/3/4/5/134597639/zukizupofemulix_sagiti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495399/normal_606027553f209.pdfIn PDF document text
    • http://idealica-ituficiale.website/g_shock_rangeman_battery_dead6atx0.pdfIn PDF document text
    • http://idealicait.website/how_to_take_a_leave_of_absence_from_work_in_californiawnvzz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_d8660fd75fbe49dea0c82dadbb3e39d9.pdf?index=trueIn PDF document text
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_c197182da97349beb776281e5591a98a.pdf?index=trueIn PDF document text
    • https://391e4f24-9fc9-4707-ac06-338edcd9f959.filesusr.com/ugd/110ef3_07839e64efb04bf2b94cc18e4b93cdf4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pisedij/47044115044.pdfIn PDF document text
    • https://9a1eab6f-da2d-4a41-99bb-18a59f11b130.filesusr.com/ugd/c2b690_7d6b0d7bfba44e9ba46ca034fc5dbd1e.pdf?index=trueIn PDF document text
    • https://327bbe42-9aa5-4ca0-80e5-6c9857058a26.filesusr.com/ugd/2b870b_808c0fc10e0d4da98996506462465960.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kukazowox/47367738430.pdfIn PDF document text
    • https://d2ea4bfc-f92a-4379-acf2-d9b69981ddb7.filesusr.com/ugd/739437_5d68f21d80ab46e682713f8a18613d04.pdf?index=trueIn PDF document text
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_508150c96ab9405786cd3a027051668d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wizakokowe/58489628266.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C7 4928 bytes
SHA-256: e30e4a4296f9d597653afe273e83c867fa9361dacf040a42252bce4887fffa0e
font_01_sfnt_off000108b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B5 11684 bytes
SHA-256: 77baca86b72f7e75164d4bbebceaede1e19768f05cea300e3d6359cbb1c7daca
font_02_sfnt_off00013058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13058 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e