Malicious PDF — malware analysis report

Static analysis result for SHA-256 a01d8cbcfb2abcb3…

MALICIOUS

PDF

86.3 KB Created: 2021-03-15 23:00:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 88a4f0247b24a8d9461d6b97dcb5981d SHA-1: 21eacd3c242d374698690cf50ad7b64d15de9b76 SHA-256: a01d8cbcfb2abcb35651f66d75871cb937d3a1b4f4a659e2fa2653f936cc74c1
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, indicating a link farm designed to manipulate search engine results or direct users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of external URIs points to an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://dugedepap.ru/strik?utm_term=what+do+pastors+talk+about+in+premarital+counseling PDF link annotation
    • https://cdn.sqhk.co/tagodepa/b5gdImU/tufupap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391623/normal_5ff02d21c9ef2.pdfIn PDF document text
    • https://cdn.sqhk.co/minofavazu/30hiahi/stormblades_apk_hack_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/lexelinowe/bp0HKmB/top_bollywood_songs_2019_youtube.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404488/normal_5ff038fecec93.pdfIn PDF document text
    • https://cdn.sqhk.co/duditizonut/btiga1i/16310918878.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/Qgf6hi3/anime_piano_magic_tiles_pop_music_2_online.pdfIn PDF document text
    • https://cdn.sqhk.co/tewisifupib/eghyBLl/lewed.pdfIn PDF document text
    • https://cdn.sqhk.co/tanusulirava/jjTBgiN/96194033952.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/khiNmif/80068963235.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496372/normal_604214cb3828a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423136/normal_603a45765b5a5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_98ba026b3cf34713a4c53eadbd2f7966.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/worksheets_on_intensive_and_reflexive_pronouns.pdfIn PDF document text
    • https://fea50346-ab34-4b67-843e-90a6383c4983.filesusr.com/ugd/bf678e_090336b8663845c480d45bda29bcc48a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rimepusox/how_do_i_know_if_someone_read_my_facebook_message.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/how_to_write_hobbies_in_paragraph.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/vabunopefar.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/gofulamoxajigugapaxu.pdfIn PDF document text
    • https://s3.amazonaws.com/musokejixami/basic_principles_of_design_scale_and_proportion_when_creating_an_image.pdfIn PDF document text
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_8fac29d61be247cbb589989d9b4b99ac.pdf?index=trueIn PDF document text
    • https://30621b86-6952-4b41-80af-4d24d830bc7c.filesusr.com/ugd/122077_9d3c7a874d654a73813cb3c51f8fd5f3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rorives/managing_personal_finances_spreadsheet.pdfIn PDF document text
    • https://76c9fb28-c10e-4950-85be-37de24a2ede8.filesusr.com/ugd/fa32a6_9757c3bd09f04daeaadfa9e1120ae8a1.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_off00011019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11019 5704 bytes
SHA-256: c075ad11d5f72500c07de648c5ba3c8db6da22b417ac15fc5e1d2a474acb5bde
font_01_sfnt_off00012363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12363 11816 bytes
SHA-256: c6456071609a91e58625bb877e0054389c3cc6f090cddfabb000a8e4e08d07e2