Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6acdb012d321713…

MALICIOUS

PDF

85.6 KB Created: 2021-06-09 10:39:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da0f07a08ecb0d66a99f2b46796e9195 SHA-1: 688f45fcd1aa8f81508585f4b16d4e4ec1efe742 SHA-256: a6acdb012d321713fff0ee487717b8eebca95e8ed0af7d8e99aa0f45e774d9d7
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and numerous external links suggest an attempt to redirect users to potentially malicious content or for SEO manipulation purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • 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://crewmak.ru/pbw?utm_term=mobile+app+wireframe+template
    • https://wonidajubiput.weebly.com/uploads/1/3/4/0/134017859/bexixijepoxip_gozemakegezuxe.pdf
    • https://selegisazo.weebly.com/uploads/1/3/5/3/135323244/dipetil.pdf
    • https://notesorujul.weebly.com/uploads/1/3/1/4/131407176/nawin_wugafur_fudabenid_jotamiwojagot.pdf
    • https://vuvunovugigadi.weebly.com/uploads/1/3/0/8/130814714/1bf862.pdf
    • https://vedabigejiko.weebly.com/uploads/1/3/1/4/131438046/a2682edbace.pdf
    • https://pojazamajalo.weebly.com/uploads/1/3/4/7/134728500/zapedek.pdf
    • https://vogavova.weebly.com/uploads/1/3/1/6/131606390/6236835.pdf
    • https://bemagage.weebly.com/uploads/1/3/4/5/134525224/c49e2813fab4ce.pdf
    • https://xilamebi.weebly.com/uploads/1/3/4/5/134598653/sonib-nobojedowigap.pdf
    • https://tamalokumolegi.weebly.com/uploads/1/3/4/6/134656593/8762587.pdf
    • https://suwodofiwimi.weebly.com/uploads/1/3/4/4/134495338/6519928.pdf
    • https://nekazexupogufeg.weebly.com/uploads/1/3/1/4/131454238/xaboj-rewitude.pdf
    • https://sukanogijero.weebly.com/uploads/1/3/4/3/134333185/newadinej_xojomero_fotaxuvijaru.pdf
    • https://cdn-cms.f-static.net/uploads/4379379/normal_6067179a3cfcc.pdf
    • https://navolujute.weebly.com/uploads/1/3/1/4/131483334/8134634.pdf
    • https://xonedanafesiliw.weebly.com/uploads/1/3/4/6/134633415/vikit_wiwixaz.pdf
    • https://cdn-cms.f-static.net/uploads/4485162/normal_601bcc17bada7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/523ec797-968a-4c92-a414-494b2cc5660e/how_to_check_serial_number_of_dell_laptop_in_windows_10.pdf
    • http://katafuzum.pbworks.com/w/file/fetch/144489852/wakisa.pdf
    • https://uploads.strikinglycdn.com/files/227e36df-10f7-4f2a-8bd0-af3d73dcf53a/how_to_connect_ihip_water_speakers.pdf
    • https://uploads.strikinglycdn.com/files/a50eaaab-1bf3-42f3-8934-26739a2b2e65/how_to_play_djembe.pdf
    • http://zekodunu.pbworks.com/f/matidulilapikujelusofak.pdf
    • http://bijinim.pbworks.com/w/file/fetch/144568452/will_isibloom_help_acne.pdf
    • http://mosutit.pbworks.com/w/file/fetch/144854793/multa_para_quem_no_usar_mscara_em_goiania.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001125e.bin
e06b461b8d4e09ba0b0e43fd54ffa5acee8fb8890d1b0ddf0aeb0b416a636c25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1125E 5108 bytes
font_01_sfnt_off000123c7.bin
798cd4a63525365e0f3f1a1648a420af605e8554aa29420ab81426c7f449d001		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123C7 11300 bytes

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