Malicious PDF — malware analysis report

Static analysis result for SHA-256 da3d51e49fc82ac0…

MALICIOUS

PDF

124.3 KB Created: 2021-04-29 20:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 00a2efd11f19da34c5950ceda5e9a340 SHA-1: bc99eb122ae12a7f82a34d15cba111f7f640adda SHA-256: da3d51e49fc82ac02ef1d509ea28119b1cf21313650304f03ca2ee72fe223609
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized content or redirectors, suggesting a link farm or phishing lure. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_UTM_REDIRECTOR_LINK indicate a deliberate attempt to manipulate search results or redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://druttle.ru/strik?utm_term=what+are+container+and+empty+elements+in+html PDF link annotation
    • https://vajibenutiw.weebly.com/uploads/1/3/4/4/134487234/2269368.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/military_decision_making_process_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459478/normal_60466c0385862.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/61743925348.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376856/normal_5fcf75c5b6ee0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477401/normal_601dd7ef50722.pdfIn PDF document text
    • https://s3.amazonaws.com/tomaxade/mumivimorifajezugujefeb.pdfIn PDF document text
    • https://s3.amazonaws.com/liluvad/blank_flashcards_template.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/xokuget.pdfIn PDF document text
    • https://sotevujek.weebly.com/uploads/1/3/4/0/134012487/vageto-vetigesakodaso-lepikax.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/vadodara_weather_report_today.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501212/normal_60297e4a92618.pdfIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/55577015971.pdfIn PDF document text
    • https://jekomijijupuda.weebly.com/uploads/1/3/1/4/131438685/6314524.pdfIn PDF document text
    • https://s3.amazonaws.com/sezewu/acpi_atk0110_windows_7_32bit.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/fozasiroxoxok.pdfIn PDF document text
    • https://s3.amazonaws.com/zategafozasiru/sidilofo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425916/normal_5fcb2f85a07ca.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/11d7094a-7ca1-4200-80a8-1a8b2f240a8c/wuzerakinunog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6f39501-3d2e-4071-adc2-8dfc8a3baa29/drug_book_nursing_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71862a63-0d69-4f97-8eb0-1c641c8f27d5/6260833656.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b469a7a6-a06c-4c88-b8ee-8b29b38a7244/daxadegafozixi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/726e94ba-63d4-4192-9a79-38ff5ce9e30c/kosatemubupetomu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/754ace5e-9d67-4d03-aefb-a6548fcb48cc/saa_green_book_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9db94c88-912b-4a2d-b4e0-cfab7fdd7305/why_will_my_riding_mower_not_start.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8e2445a-7b05-4128-845d-c25d5ee19860/647530595.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001978b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1978B 5428 bytes
SHA-256: f059bad5faefac8b010225907f95ca7b972a0d9960090465ea081388e0d18843
font_01_sfnt_off0001a9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9A4 6460 bytes
SHA-256: 5075c91efde21d990529effc03f7642f56a66ae6fa0970819f8488fdb80962b3
font_02_sfnt_off0001b96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B96A 12104 bytes
SHA-256: 3671cf2dea4e84425eace628798e65b70bae518ccb995b5f1e40f71d3da31303