Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc84a6e6b0479192…

MALICIOUS

PDF

75.0 KB Created: 2021-06-11 22:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 21bc6f7dd9933c4f1badc28c218076b1 SHA-1: af4fbf165a5d25ebe5d2db047622bc65d4b35db1 SHA-256: bc84a6e6b0479192b8d6f1e8f34d7d761f927abef153e624dd42295e1979a76c
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a phishing or malware distribution attempt. ClamAV detection and ML classification strongly indicate malicious intent. The embedded URLs, such as https://philabc.ru/pbw?utm_term=town+hall+6+night+base and https://gegivibubijob.weebly.com/uploads/1/3/4/5/134507206/d87959b.pdf, are likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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.
  • 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://philabc.ru/pbw?utm_term=town+hall+6+night+base PDF link annotation
    • https://gegivibubijob.weebly.com/uploads/1/3/4/5/134507206/d87959b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379837/normal_5fdf10a524053.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498997/normal_6007ab744543e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369909/normal_6031af1551901.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375525/normal_600e6e67d6357.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366305/normal_6025342a86f10.pdfIn PDF document text
    • https://kagozekexep.weebly.com/uploads/1/3/5/9/135956698/kuxinigukul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486523/normal_605c77a9914e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450907/normal_5fd0416dd0725.pdfIn PDF document text
    • https://vufavinit.weebly.com/uploads/1/3/4/6/134649981/berimebed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455642/normal_606c8a25e02bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486975/normal_5fd0614d67b58.pdfIn PDF document text
    • https://xuduburuk.weebly.com/uploads/1/3/4/3/134323667/2636366.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/13bb02d0-20c2-49e6-98ab-864dd0c9945d/27174547002.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/214a14fd-2ac4-47dc-947f-57df1d292c27/nombres_de_dios_en_diferentes_idiomas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5796ac92-28f5-4a46-bdbc-fba9970f157a/oz_the_great_and_powerful_2_full_movie_in_hindi_dubbed_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ed9c64d-9feb-4732-84d8-01d827d82de6/17114238674.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b86baa7-8b9d-427e-97f5-eb75a35b3a81/xopowemam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0a49071-c127-4357-8725-c654ade4637a/optiplex_390_network_drivers_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c16aa644-901d-4d9b-9946-e4072f051519/evinrude_9.9_for_sale_new.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/661bfe06-6f33-4ab1-9215-3a754e7f0722/what_are_three_examples_of_non-verbal_communication.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d593b774-2170-4b91-a2d1-efbd2c501a03/94332545942.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc5f95a0-95b3-4fd6-a87e-ea0055821e1e/netgear_ac1600_review_for_gaming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3148ce6-d821-4634-b78d-89feab49f9cd/que_comience_los_juegos_del_hambre.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecc0fd95-d725-4f04-829a-fed4f816f493/josepanozil.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_off0000e66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66F 5188 bytes
SHA-256: 997a7b343007262809984997fcba60df4f93d7af060df1bde5bee17b57b89198
font_01_sfnt_off0000f826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF826 11196 bytes
SHA-256: 485f84e7ebab11bd2c43786d292f1d821a76d00413504daa35339531f1d4acfb