Malicious PDF — malware analysis report

Static analysis result for SHA-256 c49ef9f0bc4648c1…

MALICIOUS

PDF

79.9 KB Created: 2021-03-07 03:10:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 62ec840cd499c7bbaa87419fc095d6c9 SHA-1: 5c27cabfaf0801e0042d40bcd239d3874e7ff50a SHA-256: c49ef9f0bc4648c19ef6a8cac865079325dc3bc63ca0bb48280a0b25e72c1f24
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing attempt. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to direct users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/wix?keyword=can+cats+eat+sunflower+seeds
    • https://cdn.sqhk.co/xipepovivik/agfgeja/highwaymen_band_live.pdf
    • https://cdn.sqhk.co/murajefovel/agejbjD/rawabotopojazaso.pdf
    • http://bovewitavivebu.getenjoyment.net/31329777752.pdf
    • https://vajasefa.weebly.com/uploads/1/3/4/4/134490273/c8dde99df984.pdf
    • https://jojavofeze.weebly.com/uploads/1/3/4/3/134395471/reduzesitawix-norokamekuxe-xamisumasamerad-rupiv.pdf
    • http://tevaruv.sportsontheweb.net/77370827134.pdf
    • https://pexigupor.weebly.com/uploads/1/3/4/9/134901766/0123f0f034.pdf
    • https://cdn.sqhk.co/gegefemorosu/kii4ggn/traffic_rider_apk_mirror.pdf
    • https://tojewenegekov.weebly.com/uploads/1/3/4/5/134502344/3548666.pdf
    • https://simepatu.weebly.com/uploads/1/3/4/2/134267103/9710d253c4821.pdf
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/gozolowogoxo-jopiwog-lasezesovuri-ribuwi.pdf
    • https://negapisege.weebly.com/uploads/1/3/4/6/134635707/xemelomodi.pdf
    • https://ridulimozujigo.weebly.com/uploads/1/3/4/1/134109280/xugovetefo-lasax.pdf
    • https://jidupedepinamup.weebly.com/uploads/1/3/2/6/132680921/2624554.pdf
    • https://witowufagefalob.weebly.com/uploads/1/3/0/7/130738848/namifa_mowokixexinavi.pdf
    • https://cdn.sqhk.co/matijamaj/iVkjcib/refinusanevamed.pdf
    • https://xisuviwilizej.weebly.com/uploads/1/3/4/3/134320176/fivutezabopubig.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7162f0c1-3bb2-4775-9ad2-1e34613fb889.filesusr.com/ugd/595093_261a4edbdc09493cbc989416366f8bae.pdf?index=true
    • https://8d684a1e-4078-49cd-b336-05adf09473b6.filesusr.com/ugd/2b25e8_7da373719ba74f3480db8fd6650da8a3.pdf?index=true
    • http://zejibanunepi.myartsonline.com/wuzede.pdf
    • https://ef4b221f-cfb4-47e8-bf1d-3b5092770df7.filesusr.com/ugd/4948da_0b9a3951c824440387d9e23b501394e4.pdf?index=true
    • https://5ccda086-29c7-4024-8a93-689df1f3b89c.filesusr.com/ugd/ed8107_087c0912b9384110aec5e44dca39e3ba.pdf?index=true
    • https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_003fd8f1925c410194394caf3a8595db.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb82.bin
75835c37defc3d094ccddf30fef932ce3a6fc8baa3563f407fc43e56f1daad96		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB82 5012 bytes
font_01_sfnt_off00010ca9.bin
e400d6e046c4414b8c267fe8412f40b8669b8a0df4e98a5d4f680a7174c88a07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA9 11180 bytes

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