Malicious PDF — malware analysis report

Static analysis result for SHA-256 455ed386535c3995…

MALICIOUS

PDF

65.1 KB Created: 2021-03-27 10:13:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 39bcef6f9a141c76d4600ca81b39eb88 SHA-1: 97424462acac480c9115464b09c8a8a00b579e98 SHA-256: 455ed386535c3995d81f5005f63fa30813a460232a210af003a779fe772cc61e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. The document body, though heavily obfuscated, appears to contain keywords related to generator parts, suggesting a lure. The presence of external URIs and link farm characteristics indicates an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/strik?utm_term=honda+6500+sx+generator+parts PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4370273/normal_5fc8268f62f24.pdfIn PDF document text
    • https://cdn.sqhk.co/xunijejozi/AGjijFD/love_and_respect_family_dvd.pdfIn PDF document text
    • http://lirebuwoke.mygamesonline.org/laxovufajezeripinof.pdfIn PDF document text
    • https://cdn.sqhk.co/gasidonoda/xLiaghG/bibtex_bib_file_format_example.pdfIn PDF document text
    • http://vevapefin.sportsontheweb.net/69574401034.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474446/normal_5fe0447c868f2.pdfIn PDF document text
    • http://guketepudepi.iblogger.org/8263964526.pdfIn PDF document text
    • http://zupedaganivo.66ghz.com/flightradar24_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/xibetevoxaj/rAThhji/gunship_battle_3d_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392441/normal_5fdd96d749e47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376380/normal_604cc3441868f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kamuvojev.epizy.com/gta_san_andreas_cheats_file_free_download.pdfIn PDF document text
    • https://e5058785-d3d1-442e-b0ad-d0045053dde7.filesusr.com/ugd/17c622_f472bdff35c64665acdd8cea3a5ccb6a.pdf?index=trueIn PDF document text
    • https://88749095-6fd7-453f-8e8a-15b48fe47dd1.filesusr.com/ugd/e4d7df_708ba95303954ba1952957725e442a3c.pdf?index=trueIn PDF document text
    • https://6a8c3f3f-5248-4e80-80e0-4bf2c04f72bc.filesusr.com/ugd/8b2c09_53a809b5793946da98d3e42a973b9616.pdf?index=trueIn PDF document text
    • http://febarufowit.epizy.com/surface_area_of_triangular_prism_answer_key.pdfIn PDF document text
    • http://koxujitedosu.epizy.com/canon_800d_specifications.pdfIn PDF document text
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_48a0bd6fd01e42238f2517f625428cbf.pdf?index=trueIn PDF document text
    • https://3b044092-e341-4c69-a8e2-52b14fc1865f.filesusr.com/ugd/370021_748948b429f7446593a9b5217ec9b7c1.pdf?index=trueIn PDF document text
    • https://9f53eded-325d-4e02-8430-7c09bd872488.filesusr.com/ugd/e04405_41ee9b70396a424484cd8b1481aa9813.pdf?index=trueIn PDF document text
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_cfa666cf45af4f1b9e452325dd3db0d3.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_off0000c364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC364 5544 bytes
SHA-256: 461974ef28c850e4a3566493e58045e6962b20cedab790fcb293bbb0f051a6d8
font_01_sfnt_off0000d649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD649 9736 bytes
SHA-256: 34bf3c3a940c291f2a6b4a1c2cb5f0af564cb46c5a9462a6c869521bad4bf1d9

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