Malicious PDF — malware analysis report

Static analysis result for SHA-256 26b12f2c0a1d8892…

MALICIOUS

PDF

86.1 KB Created: 2021-03-18 21:31:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6904dae78751df02aeb4cdd1ebc4caf5 SHA-1: c975ae2f2fec95e2a710d9e993c6af11a6873527 SHA-256: 26b12f2c0a1d8892fea93d9806209ffdf046aabd898bcb00ffdd160e2dd810a7
74 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The 'ML_NYX_PDF_MALICIOUS' heuristic and the presence of external URIs strongly suggest malicious intent. The document body, though heavily obfuscated, contains text related to 'Java tutorial pdf free download', indicating a lure to download potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=java+tutorial+pdf+free+download+in+hindi PDF link annotation
    • http://nukobom.22web.org/57860921900.pdfIn PDF document text
    • https://cdn.sqhk.co/xugiwatokax/hevbXzs/batua_sa_muh_dj_ringtone.pdfIn PDF document text
    • https://cdn.sqhk.co/xenojepezere/Nhiieij/kosotesogag.pdfIn PDF document text
    • https://nemoradusa.weebly.com/uploads/1/3/2/6/132682182/5647832.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4504791/normal_5fcf7c6d7a467.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411228/normal_6039ea0c47d83.pdfIn PDF document text
    • http://kobodesuwid.getenjoyment.net/workout_routine_for_weight_loss_and_toning.pdfIn PDF document text
    • https://fazugiwe.weebly.com/uploads/1/3/4/0/134012697/199254.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389085/normal_5fcaa4e25508e.pdfIn PDF document text
    • https://cdn.sqhk.co/bawusipa/jcjdaif/dagannoth_rex_guide.pdfIn PDF document text
    • https://kukanoli.weebly.com/uploads/1/3/4/6/134641169/d3ba0e9ee94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408997/normal_604341a7bd930.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379229/normal_604d80222719b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/jezekemunidup/17249615362.pdfIn PDF document text
    • http://pumazujawawu.rf.gd/atal_pension_yojana_form_allahabad_bank.pdfIn PDF document text
    • http://witesenigo.atwebpages.com/bahaya_boraks_bagi_kesehatan.pdfIn PDF document text
    • http://kawuduzan.rf.gd/arnold_renderer_for_maya_2016.pdfIn PDF document text
    • http://tevufojetuxovud.rf.gd/gavopigemi.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/how_to_turn_off_adt_voice.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/esquire_fashion_guide_for_all_occasions.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/zaxalategoputugiridob.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10531 5092 bytes
SHA-256: ed996f7e7afb2748249ee3c3563d4fb8b6fd42e68860d33ca65e3c78dbfafb6f
font_01_sfnt_off00011696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11696 11584 bytes
SHA-256: ca25c9527daa03df4ba3352810eb0cd6cdde050cec91dca542c2ad21fccc3d0e
font_02_sfnt_off00013e40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E40 3344 bytes
SHA-256: a2a3166e99f0d796ada178c10df18ef6dcdd204c3795f2f6135bb2e01d14df51

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