Malicious PDF — malware analysis report

Static analysis result for SHA-256 55df010db772f807…

MALICIOUS

PDF

83.8 KB Created: 2021-03-10 06:47:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6bea1d71321f0320d27234e5d973577b SHA-1: d1355304998b0b4c320f57dfad6a4914dba65696 SHA-256: 55df010db772f8070e8ceb11ca17b591afa82a1cbe941810bb33bd32cbc48ad4
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The presence of numerous external links, particularly those pointing to PDF files with numeric slugs, suggests a link farm or SEO manipulation tactic. The ClamAV detection as Pdf.Phishing.Trojan further supports its malicious classification. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/wix?keyword=madre+de+marco+antonio+solis+jr
    • http://jigapenufi.medianewsonline.com/konsep_ketuhanan_dalam_agama_hindu.pdf
    • http://saxobupazes.sportsontheweb.net/fikamazurenufe.pdf
    • http://nepoxiduvilej.scienceontheweb.net/real_estate_principles_11th_edition.pdf
    • https://cdn.sqhk.co/veladaxuzeba/OjgIxij/golf_magazine_top_100_in_the_us.pdf
    • https://cdn.sqhk.co/jusulikipe/hciau1Y/61182951390.pdf
    • http://pikegupima.medianewsonline.com/burnham_boiler_parts_near_me.pdf
    • http://barajofa.mywebcommunity.org/kesijiwemolalo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://keputeka.epizy.com/92677053925.pdf
    • https://05b56818-8b0b-4484-a411-4f1234233f1c.filesusr.com/ugd/e49726_a1894b340c70473eb27e0d9dde4a01cc.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c4b71d20-00e8-4f29-a4ea-eb94b19752d9/driver_genius_professional_with_crack.pdf
    • https://uploads.strikinglycdn.com/files/a8fdc23a-1dbd-45de-8eb3-d7bc0c17647e/mississippi_drivers_license_renewal_appointment.pdf
    • http://kudetewususitup.rf.gd/canada_elections_act.pdf
    • https://uploads.strikinglycdn.com/files/cf169012-4c5f-4efc-9e5a-ab1ac93f961e/49875474318.pdf
    • https://uploads.strikinglycdn.com/files/746ff29e-ebcb-4d9f-a71e-4c427009ac80/24609282517.pdf
    • https://uploads.strikinglycdn.com/files/c5fd9db1-90f6-4024-8cb2-65761c9decc6/xusewifakifipaze.pdf
    • http://kugukokoner.myartsonline.com/kegirejarosixid.pdf
    • https://56148a0a-83a3-4003-94ff-78d3044b7c00.filesusr.com/ugd/6f5f23_829f0ad099ac47bf8bc6257abe9c3ed7.pdf?index=true
    • http://wifofevowogak.onlinewebshop.net/samsung_note_20_plus_price_in_malaysia.pdf
    • http://xuvanemesu.rf.gd/20715332757.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1c5.bin
1e2d5ec13eb2ab5bde403cbe977523a1da8d9a8081210cc9bb264b6ece0f5371		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C5 5168 bytes
font_01_sfnt_off0001034b.bin
606f7a00a3a2c8accdf8178ac95c5463408bf71a6f0fe0a6677ba11852aad828		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1034B 12344 bytes
font_02_sfnt_off00012b44.bin
bcfecb9fde4b74e4a2b692e15caf305b2988a1cfe4c6386614002e38d35feb86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B44 16168 bytes

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