Malicious PDF — malware analysis report

Static analysis result for SHA-256 13355669e53e4551…

MALICIOUS

PDF

80.6 KB Created: 2021-05-28 02:57:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 10c142215d8977a1249641dd4d8d9eaa SHA-1: b03215e8bccdce4da917b240356cf3b717446f9d SHA-256: 13355669e53e4551fd813e85c5868baf9b93107b2ec78a0578f54e6ff703ce0e
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, indicating a link farm designed for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for malicious actions.

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://zajinet.ru/strik?utm_term=how+to+crumple+tie+dye+socks PDF link annotation
    • https://gisoroweri.weebly.com/uploads/1/3/4/8/134893792/1715258.pdfIn PDF document text
    • https://removevas.weebly.com/uploads/1/3/4/4/134443453/9491057.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4366022/normal_60afe3120ed44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392215/normal_60269d6edb493.pdfIn PDF document text
    • https://nudabixe.weebly.com/uploads/1/3/4/5/134505388/bivofulipuvamisat.pdfIn PDF document text
    • https://gelurojaf.weebly.com/uploads/1/3/4/6/134697462/2894833.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423443/normal_603463c8374d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471467/normal_5fd39971cbc06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464734/normal_6063892b789b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375352/normal_5fc9834e1bdb3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449177/normal_5fe4eb69a64f6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd83bb1e-3729-44b1-bc9c-ca26f4ae532d/lokexutefomaborirovevolaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/702ecc03-21e2-4ecb-9cbc-d1385e9138ba/lonuwonofapuzogeze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9082c492-8fd0-4b99-bcda-675e175833a7/zimozavugadudiwim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/717a8a4d-79c1-4391-b2e2-67614c11ae0c/wrong_turn_4_full_movie_download_in_hindi_filmyzilla.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/879a4c18-a8ad-4356-bbaa-4a10f9064396/57836990531.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/624e6d65-1db8-4e39-b82b-18ffd9f86ac2/diropib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/092133f4-ba29-4876-a603-11a30a17b9f8/gugebesufixoxov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ae25200-92ff-4ecb-92e4-f097b05ee123/will_gta_5_be_backwards_compatible_ps5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f26854df-a0a7-493c-8d58-a5268684d452/what_are_some_words_that_have_the_suffix_ly.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52b89477-9ba1-43f9-9031-8adb9c53d1ef/adobe_photoshop_cs6_tpb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53947797-1943-42bc-ab17-c03e60fe6a26/is_crossfit_a_form_of_hiit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a69d0880-dc50-4e59-8b41-091e9ad10ed3/power_rangers_spd_full_movie_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/169f9460-8ce1-4dc9-978f-5a36c9feb675/powijilivaguwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6109a776-cf2e-4fe9-931e-d1b48931b2a4/how_to_fix_samsung_washer_not_draining.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_off0000ff33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF33 5228 bytes
SHA-256: dd068a988d7d8f167448fa64a27c0089ad06294fcdc8c54a16ebcf276b2913c8
font_01_sfnt_off000110fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FD 10640 bytes
SHA-256: cc2023d4e872ca363d96a1ca804df1a41fdacb72d6d3d6efbe6896545423edf3