Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a64cd2e9bffcd5…

MALICIOUS

PDF

73.5 KB Created: 2021-06-14 05:08:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 488bdbb5f5548e7c748ebcccd5ad1702 SHA-1: 24b874cc3b7d3b53d2d3bbb2836a229fbf832dc2 SHA-256: a4a64cd2e9bffcd55a8129ec4d72843d413c05453c691be4b62cdd41c36b7e5d
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 services, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains text related to 'Auto bulb lookup', likely a lure to direct users to malicious sites.

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 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://pistant.ru/pbw?utm_term=auto+bulb+lookup PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454438/normal_5fe6b28de6612.pdfIn PDF document text
    • https://dipojujepu.weebly.com/uploads/1/3/4/5/134526160/5280301.pdfIn PDF document text
    • https://jutegonepot.weebly.com/uploads/1/3/4/0/134016653/dutukel.pdfIn PDF document text
    • https://duvutotan.weebly.com/uploads/1/3/0/7/130775700/jebujaz.pdfIn PDF document text
    • https://setovejuno.weebly.com/uploads/1/3/2/6/132682792/172586.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418367/normal_605a1ee62a6a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387037/normal_601e264a3eae4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447087/normal_60609862ad8d7.pdfIn PDF document text
    • https://kewetarutedur.weebly.com/uploads/1/3/0/9/130968996/jutunedoduzivuke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415531/normal_605ff23facdcd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464078/normal_5fdf7850753c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401517/normal_60075cb0f0a39.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gudotoxej.pbworks.com/w/file/fetch/145212660/maketenavafikebevo.pdfIn PDF document text
    • http://subazim.pbworks.com/w/file/fetch/144683667/the_incredible_adventures_of_van_helsing_3_best_solo_class.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8defe8d4-2ca6-4d28-861f-41b0af7e19be/jack_the_giant_slayer_full_hd_movie_download_in_hindi_1080p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/750bc98a-dde3-44e8-868d-f705546237df/4820645618.pdfIn PDF document text
    • http://magogopowo.pbworks.com/w/file/fetch/144474120/pedolediban.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c10a5d76-89fd-465d-8c5b-c4586f9d3e28/igcse_checkpoint_past_papers_science.pdfIn PDF document text
    • http://zizalojuwe.pbworks.com/w/file/fetch/145147200/kigovolegulunorupeki.pdfIn PDF document text
    • http://kasaxuwux.pbworks.com/w/file/fetch/144917103/the_karate_kid_part_2_full_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74ccf459-91d0-4b8c-ac11-ceb48cf3a3ec/fusuwukekabom.pdfIn PDF document text
    • http://dumajimov.pbworks.com/w/file/fetch/144867285/what_is_the_average_male_singing_range.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df001ab0-5faa-43f6-9428-59a7be69cb18/94521077795.pdfIn PDF document text
    • http://nagomax.pbworks.com/w/file/fetch/145193043/v380_pro_app_for_pc.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_off0000e579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE579 4524 bytes
SHA-256: 028253c3075c3fa8b5a9f1b88bc3c75509155a38784b66b6df2f38ea39116e2f
font_01_sfnt_off0000f4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EC 10580 bytes
SHA-256: 6acbe17581a72d06b5087068314a79798f654f20f09bca2563df5023dbe0cf2b