Malicious PDF — malware analysis report

Static analysis result for SHA-256 538de01d94b48f85…

MALICIOUS

PDF

87.3 KB Created: 2021-03-30 10:32:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 535434f169e2aafc1225f25c91f3f5ac SHA-1: 61ddffd0792bc2612b4b5158ab5e6d8d64e3c039 SHA-256: 538de01d94b48f85358b06570cec91a79e5326c456942195a3e38ea715c05bc8
164 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' containing 30 links, suggesting a tactic to distribute or redirect users to malicious content. While no scripts were extracted, the presence of numerous URLs and the 'PDF_URI' heuristic point towards a phishing or content-distribution attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • 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://leonvi.ru/award?keyword=bukhari+bangla+pdf+download
    • https://daxusumupazi.weebly.com/uploads/1/3/4/7/134702932/zezokewedofob.pdf
    • https://static.s123-cdn-static.com/uploads/4475383/normal_60041e9f98f59.pdf
    • http://zonuvak.medianewsonline.com/autocad_software_download_free_for_windows.pdf
    • https://static.s123-cdn-static.com/uploads/4467601/normal_5fcd5a5b8d0c8.pdf
    • http://lekagodewod.iblogger.org/how_to_connect_a_afterglow_ps3_controller_to_ps4.pdf
    • https://vezaxudikofexi.weebly.com/uploads/1/3/4/6/134654587/27255.pdf
    • https://nogudoge.weebly.com/uploads/1/3/4/0/134017621/wodekarinar-fetado-konovijebaw.pdf
    • https://cdn-cms.f-static.net/uploads/4388271/normal_601c9cca94e5a.pdf
    • https://xafinuwexedigu.weebly.com/uploads/1/3/1/3/131379324/vabovojug-wixosupumeb-fijum-wevupexudujiriv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/genijusemu/how_is_going_your_day_answer.pdf
    • https://s3.amazonaws.com/wukara/nuzod.pdf
    • https://d4180a97-8dd0-4bf1-9e2f-d1b128d1a64d.filesusr.com/ugd/ae059d_df4e4548b2e2450d8cde97a602f98526.pdf?index=true
    • https://s3.amazonaws.com/geradi/28591543619.pdf
    • http://mawokale.myartsonline.com/learn_english_through_story.pdf
    • http://kovobopejuwego.rf.gd/bow_tie_medical.pdf
    • http://balazetesu.epizy.com/abbyy_finereader_professional_edition_9._0_free.pdf
    • https://64b67c6e-fbbd-4787-add8-9ed3e274c95c.filesusr.com/ugd/eb6612_329f66b74802457a8056918184f4a0ba.pdf?index=true
    • http://xijovapafibowuw.rf.gd/serial_de_windows_8.1_pro_n_64_bits.pdf
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_dc519c9af1584555b8443aafd3b1260b.pdf?index=true
    • https://s3.amazonaws.com/lofese/zodobibobopelefivutegiw.pdf
    • 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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e745.bin
25595179a1c959b8f24c245c25ae277e91bdce21f8fa544f1f409bf63b60318d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE745 5468 bytes
font_01_sfnt_off0000f9ef.bin
880fc4f7dca5e3b08bb1515e0dba2b6f92bf67ebb0190dcd7cd9ab0c822f5f23		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EF 17148 bytes
font_02_sfnt_off00012bce.bin
cc35417b7e0c1a6e553494ccae61a67dbfa18e9c6c48a5a151d67b3921f165af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCE 10688 bytes

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