Malicious PDF — malware analysis report

Static analysis result for SHA-256 a706b03c8befbdf0…

MALICIOUS

PDF

72.4 KB Created: 2021-03-05 10:07:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 18c3019342acd7fbac594a1017ac13e2 SHA-1: 35b14923419bec4f95cf7f75237ee1b11205d0e8 SHA-256: a706b03c8befbdf04a5823e4593ce6dfb8d4d0d3e7a0bc6c5e590a73446c0032
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://golowaki.ru/wix?keyword=sentence+frames+for+discussion PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470521/normal_60207ead19182.pdfIn PDF document text
    • http://xejebowipuzusim.iblogger.org/what_is_the_main_purpose_of_educational_technology.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471688/normal_5fc5a5d68f5f6.pdfIn PDF document text
    • http://bopugafuwu.scienceontheweb.net/xbox_live_error_code_8015d002.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458634/normal_600b5434a15e4.pdfIn PDF document text
    • http://fajiriduxir.medianewsonline.com/xutesosafevebelutekowire.pdfIn PDF document text
    • http://vobigabifinu.22web.org/jolipuvusarazesadeno.pdfIn PDF document text
    • http://insurancecarusa.com/summer_baby_monitor_battery_not_chargingsdx5i.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378852/normal_5ff829d569c99.pdfIn PDF document text
    • http://vugekowuzujed.scienceontheweb.net/77419302348.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404113/normal_60296e69df83b.pdfIn PDF document text
    • http://gamowenugeg.sportsontheweb.net/percy_jackson_and_the_battle_of_the_labyrinth_quotes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368955/normal_6008d5329852c.pdfIn PDF document text
    • http://nigma24invest.online/dapugikajojejitewz43j0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454995/normal_602b394417c7d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9a60fab3-6fb0-4be7-9305-b2e3cc44d963.filesusr.com/ugd/811c4f_65f9faf6fce34e00b4fa913a8bf9f5d7.pdf?index=trueIn PDF document text
    • http://wifudozakiteg.epizy.com/juwerixemi.pdfIn PDF document text
    • https://97783159-ced7-426e-9fbd-60d2bb3342fb.filesusr.com/ugd/00058f_b601368d8bbf409aafdc01086ebf0bb5.pdf?index=trueIn PDF document text
    • http://limixumijegaf.epizy.com/liwulakazorifa.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF4 5236 bytes
SHA-256: fca4785d7507a987bc5b81c2d4a119806296889e086f1ddb3d21a98c00ee72ce
font_01_sfnt_off0000f1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B1 10240 bytes
SHA-256: 1013c4a651f3a4d3473fe1db63b5d5595ed8256d2ce1f80622ceebb7b35707aa

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