Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7a6c4c432efb590…

MALICIOUS

PDF

124.5 KB Created: 2021-05-09 16:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e3b4fecc05e8fdd186ef324b82b35bed SHA-1: 58b03b83fa5fe03598bca429969b9b57059cf897 SHA-256: f7a6c4c432efb590cbb074170fccf1848423cf8806f53bafcffdbf628233141e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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.
  • 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://jottigo.ru/strik?utm_term=soil+mechanics+formulas+pdf PDF link annotation
    • https://pofekabebo.weebly.com/uploads/1/3/0/7/130739116/12a52f.pdfIn PDF document text
    • https://kogemujifogez.weebly.com/uploads/1/3/4/3/134344524/rexidina_vawivare_jaropofodid.pdfIn PDF document text
    • https://dexekuweda.weebly.com/uploads/1/3/4/7/134705305/xigapolonafom.pdfIn PDF document text
    • https://woniwisupu.weebly.com/uploads/1/3/4/2/134266019/bumanasejizazeronab.pdfIn PDF document text
    • https://zimegusak.weebly.com/uploads/1/3/4/6/134605775/rosepexefitadigis.pdfIn PDF document text
    • http://rosutob.getenjoyment.net/99736351252.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/job_description_template_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c11b3710-6331-4652-9923-4223728e1aa0/litar.pdfIn PDF document text
    • http://pasifowon.atwebpages.com/the_witcher_3_ps4_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/carel_pco_password_reset.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/cara_bobol_wifi_id_pakai_android.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/tafuzoju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f590e5a-a60c-46eb-9423-ee83fa4b43f9/gasulibenisefepi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f62d9a85-bf0d-4d9e-9293-8faa873a88f5/matatetutafafex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6069685-5522-42e8-9492-1019286e44d0/lord_of_the_flies_chapter_8_9_10_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/how_to_simplify_a_rational_algebraic_expression.pdfIn PDF document text
    • https://aa5f33e9-793b-4807-a257-9eac84d314d0.filesusr.com/ugd/aa57b2_359a332848de4c97969e23dd57b1912e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/how_to_use_the_mophie_juice_pack_air.pdfIn PDF document text
    • https://s3.amazonaws.com/zexozavo/escape_room_game_answers_level_43.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9364dad-6282-4f4e-bddd-60c1c5d9d7ed/apa_format_biology_lab_report.pdfIn PDF document text
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_c251cc532487492b925cea431b35a65b.pdf?index=trueIn PDF document text
    • https://af30af13-e0b7-4de0-aca7-7783c01eade2.filesusr.com/ugd/9757e7_738e5d5b14944e8e9c0e834b9bc1a78f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fapaga/chemistry_hsc_past_papers.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000191d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191D9 5500 bytes
SHA-256: 37022b6798fb7c910a8203dd447b1f97099b21a231482a1a78e0e31635dba4c4
font_01_sfnt_off0001a460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A460 12580 bytes
SHA-256: 597d1ef13adb498599864beb150611c54c8a62060093d7fceebd60f86a16524a
font_02_sfnt_off0001cf8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF8E 16036 bytes
SHA-256: 354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb

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