Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce13afebd93412f4…

MALICIOUS

PDF

82.3 KB Created: 2021-03-15 15:32:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8400346e9780589ee82690bc97009381 SHA-1: 54f7b906524cde20d1d811cbfa3f6032158d934b SHA-256: ce13afebd93412f4f68ea5a33c0eaad152cab6d852d1bcb0901b27eb6e917104
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. One of the embedded URLs, 'https://baarspo.ru/wix?keyword=graphing+trends+in+the+periodic+table+answers', is likely used to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/wix?keyword=graphing+trends+in+the+periodic+table+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416665/normal_604a973f6f368.pdfIn PDF document text
    • https://cdn.sqhk.co/kapimetavis/jVjgieJ/air_defense_command_squadrons.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonaxadu/dDUWfIk/drastic_ds_emulator_apk_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367277/normal_5fd0e5ebe6256.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465255/normal_602eb2fee05ee.pdfIn PDF document text
    • http://strgb2.ru/geometric_series_examples_with_solutionsbnttt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499329/normal_6004704c57ddc.pdfIn PDF document text
    • https://cdn.sqhk.co/fafafesabok/jaojugi/google_image_search_upload_photo_android.pdfIn PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/mojbehc/milton_maize_maze_discount_code.pdfIn PDF document text
    • http://copyrightsupporteds.com/50883276137k9s26.pdfIn PDF document text
    • https://cdn.sqhk.co/muzorefu/dT0Ztjf/lisokupi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493888/normal_5ff3691bc355e.pdfIn PDF document text
    • http://pitushok.fun/1249113644wehzo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374708/normal_60370e3febe03.pdfIn PDF document text
    • https://cdn.sqhk.co/dajuzafum/Bicgwig/gasarukenexofo.pdfIn PDF document text
    • https://cdn.sqhk.co/wofetewa/FNjcyYn/pawaxasikuwekiruzenukewaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419198/normal_60471222d62ca.pdfIn PDF document text
    • https://cdn.sqhk.co/fapetemiji/gdIZihE/kowekota.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_c519c07ec7674a019961d93850f37738.pdf?index=trueIn PDF document text
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_821c479ff3f04c86b93983700834dd12.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53A 5384 bytes
SHA-256: 478f8501ce30561cc7d7ea6320dd3a6aa30cd67d7ce0d517d545c3a9af12f140
font_01_sfnt_off0001078a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078A 10664 bytes
SHA-256: 67ef0238b0e9b7003e05601dbe43d70c80492375e0777f6fbc1f09fc10a44a84
font_02_sfnt_off00012c00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C00 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333