Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d6438ab41da3b7…

MALICIOUS

PDF

69.7 KB Created: 2021-03-31 02:24:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 5b237c1ca89eb256932ef779c95ed8bf SHA-1: a9f1a781be16661b473d09158d912c2dee3a6f3e SHA-256: 28d6438ab41da3b75a629ad8f82c4f128c60d45c64b72e4434bfe3eb47a7ad3a
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or known malicious redirectors, indicating a link farm designed to lead users to potentially harmful content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=what+toppings+does+subway+offer In PDF document text
    • https://safapovajedetux.weebly.com/uploads/1/3/4/6/134642125/tetajudosojidid-sulufomawotap-dejeb-sibagufabux.pdfIn PDF document text
    • http://goods-amzon.com/widagurexopunaxigirosm86kk.pdfIn PDF document text
    • https://dunujamovexen.weebly.com/uploads/1/3/4/3/134361976/3140647.pdfIn PDF document text
    • https://fojowixejomad.weebly.com/uploads/1/3/2/6/132681658/dabowatox_zifumozegelex.pdfIn PDF document text
    • http://penafur.scienceontheweb.net/2005_yamaha_v_star_1100_maintenance_schedule.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://sixesijilolun.mywebcommunity.org/agitator_adalah.pdfIn PDF document text
    • http://sazinoz.mypressonline.com/bujupesesime.pdfIn PDF document text
    • http://leopolds.space/shepherd_the_flock_of_god_2019_editionm658e.pdfIn PDF document text
    • http://xutexukoxobofi.mywebcommunity.org/introduction_symbolic_logic.pdfIn PDF document text
    • https://vesekukoluvili.weebly.com/uploads/1/3/4/7/134759730/zuxole.pdfIn PDF document text
    • https://sokirokesavosa.weebly.com/uploads/1/3/4/9/134901907/varegizajup.pdfIn PDF document text
    • http://am-sound.ru/4259626301akyfl.pdfIn PDF document text
    • http://palikexifumalam.mywebcommunity.org/73074753104.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://situxunekidini.epizy.com/el_arte_de_la_guerra_google_drive.pdfIn PDF document text
    • https://a9750898-a066-404d-a796-54a2f5ad13bb.filesusr.com/ugd/60231a_86f6c723edc04b8a83d533e8014f15c5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/dbt_skills_training_manual_download.pdfIn PDF document text
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_d905ebc6241f4afa8fcfcc7376e885bd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lixuzo/barrons_sat_biology_online_test.pdfIn PDF document text
    • https://a6f18165-9bfd-46c9-8f51-0ab50cd0b687.filesusr.com/ugd/265c7a_c58f3f458759458a9ba721212c1237f5.pdf?index=trueIn PDF document text
    • http://pisobugesonanin.epizy.com/41959906227.pdfIn PDF document text
    • https://1a6c606f-1efd-495f-9370-57f425d809fd.filesusr.com/ugd/1be480_c378ed8736834a888590993072cbd741.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/azure_backup_data_sheet.pdfIn PDF document text
    • https://90ff81fc-98d9-4e53-96a3-aaa5c1c2042e.filesusr.com/ugd/bb5aff_19db0decc31b423f9fea0618db505d36.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD420 5616 bytes
SHA-256: 8ec41a9cdfbd2a9cadebc96a4d4fbfd8845f4645d1789486a1ea2b00e9a6e12e
font_01_sfnt_off0000e754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE754 10032 bytes
SHA-256: b490b67608054da0e6ddce4f70a2f9e37758299b607dd1cc19bad1e4861131c7

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