Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f9e458eac9cfaad…

MALICIOUS

PDF

83.6 KB Created: 2021-03-08 09:43:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: d3f7ea1384bdad6f4c7b4c9e69ac69f0 SHA-1: 0a967c22741ac7aa9c7dc907957f5b566904f2a5 SHA-256: 5f9e458eac9cfaad1d53f692b09db09a1182cae1d62cc4cb8f67ba8e3eb9e79c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pelibifir.ru/123?utm_term=how+many+carbs+in+bojangles+chicken+bites PDF link annotation
    • https://cdn.sqhk.co/baxajufim/ifgGhcJ/59437740855.pdfIn PDF document text
    • https://cdn.sqhk.co/faserekino/gcqhfie/10542710530.pdfIn PDF document text
    • http://gejesixave.scienceontheweb.net/sepavisobomevipavewibupa.pdfIn PDF document text
    • http://tasigezagu.scienceontheweb.net/buwese.pdfIn PDF document text
    • https://cdn.sqhk.co/supuzeren/ifgf8AI/cover_fire_offline_shooting_games_size.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408984/normal_5fc948eae9cc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469631/normal_6011ec9154b94.pdfIn PDF document text
    • http://dojemop.mywebcommunity.org/twilight_saga_2008_full_movie_watch_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487419/normal_5fd830cc11f4b.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvisisitinu/ejgiaEB/stickman_gun_shooter_3d_apk.pdfIn PDF document text
    • http://retapadu.medianewsonline.com/1900815174.pdfIn PDF document text
    • http://fajamad.mypressonline.com/galiwejubaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zubata/adobe_reader_11._0_09.pdfIn PDF document text
    • https://adc0bc6f-2b4d-4951-bce0-9128d215fa34.filesusr.com/ugd/5ea4d5_b4ab2d7fa2584d36b53a514f4a4b6324.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/whole_new_world_piano_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/224cf526-4565-4f0b-8a7b-915cf5e6a029/science_without_religion_is_lame_meaning.pdfIn PDF document text
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_c7d591c9949944f2801ab3b532fd25a8.pdf?index=trueIn PDF document text
    • https://12a3aa02-022d-4218-8efb-90aa4388683d.filesusr.com/ugd/6dfd9b_979487d9259847eaad61d4122e066acc.pdf?index=trueIn PDF document text
    • https://a765b249-d442-4b07-8ea9-8318d996b894.filesusr.com/ugd/902d29_ca7a0b8c0cd848ca9a6f74bcecbc7664.pdf?index=trueIn PDF document text
    • https://9ebe8999-295a-4f11-87dc-c96f3e1b46ff.filesusr.com/ugd/8de238_72ac0a22576540b28049da99830c8846.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/brave_web_browser_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/square_root_20_simplified_radical_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/420e5519-0d49-49c7-b256-1d7399f0e15a/glass_mineral_wool_fire_rating.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_off000105b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B4 5648 bytes
SHA-256: 81b5db29ac53a00f1e90ff8e0d13ea2a103476db15d21bf47c0ada12e733373f
font_01_sfnt_off000118d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D1 11896 bytes
SHA-256: b5bf17f75685449b0c7f54ea3c1773f355e15c0f8581b57a1920182f8787911f