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)
MD5: 00a2efd11f19da34c5950ceda5e9a340 SHA-1: bc99eb122ae12a7f82a34d15cba111f7f640adda SHA-256: da3d51e49fc82ac02ef1d509ea28119b1cf21313650304f03ca2ee72fe223609
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics, including a critical finding for a PDF link farm containing numerous external links. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to redirect users to potentially malicious or SEO-manipulated content, aligning with a phishing or content distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://druttle.ru/strik?utm_term=what+are+container+and+empty+elements+in+html
    • https://vajibenutiw.weebly.com/uploads/1/3/4/4/134487234/2269368.pdf
    • https://cdn-cms.f-static.net/uploads/4459478/normal_60466c0385862.pdf
    • https://static.s123-cdn-static.com/uploads/4376856/normal_5fcf75c5b6ee0.pdf
    • https://cdn-cms.f-static.net/uploads/4477401/normal_601dd7ef50722.pdf
    • https://sotevujek.weebly.com/uploads/1/3/4/0/134012487/vageto-vetigesakodaso-lepikax.pdf
    • https://cdn-cms.f-static.net/uploads/4501212/normal_60297e4a92618.pdf
    • https://jekomijijupuda.weebly.com/uploads/1/3/1/4/131438685/6314524.pdf
    • https://static.s123-cdn-static.com/uploads/4425916/normal_5fcb2f85a07ca.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xalasawu/military_decision_making_process_manual.pdf
    • https://uploads.strikinglycdn.com/files/11d7094a-7ca1-4200-80a8-1a8b2f240a8c/wuzerakinunog.pdf
    • https://uploads.strikinglycdn.com/files/c6f39501-3d2e-4071-adc2-8dfc8a3baa29/drug_book_nursing_2020.pdf
    • https://uploads.strikinglycdn.com/files/71862a63-0d69-4f97-8eb0-1c641c8f27d5/6260833656.pdf
    • https://s3.amazonaws.com/mipizaju/61743925348.pdf
    • https://uploads.strikinglycdn.com/files/b469a7a6-a06c-4c88-b8ee-8b29b38a7244/daxadegafozixi.pdf
    • https://uploads.strikinglycdn.com/files/726e94ba-63d4-4192-9a79-38ff5ce9e30c/kosatemubupetomu.pdf
    • https://s3.amazonaws.com/tomaxade/mumivimorifajezugujefeb.pdf
    • https://uploads.strikinglycdn.com/files/754ace5e-9d67-4d03-aefb-a6548fcb48cc/saa_green_book_free_download.pdf
    • https://s3.amazonaws.com/liluvad/blank_flashcards_template.pdf
    • https://s3.amazonaws.com/zidosozawok/xokuget.pdf
    • https://s3.amazonaws.com/povodijirig/vadodara_weather_report_today.pdf
    • https://s3.amazonaws.com/vebogotexaf/55577015971.pdf
    • https://s3.amazonaws.com/sezewu/acpi_atk0110_windows_7_32bit.pdf
    • https://s3.amazonaws.com/wopari/fozasiroxoxok.pdf
    • https://uploads.strikinglycdn.com/files/9db94c88-912b-4a2d-b4e0-cfab7fdd7305/why_will_my_riding_mower_not_start.pdf
    • https://uploads.strikinglycdn.com/files/f8e2445a-7b05-4128-845d-c25d5ee19860/647530595.pdf
    • https://s3.amazonaws.com/zategafozasiru/sidilofo.pdf
    • 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
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

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

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