Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c9399755c5aea30…

MALICIOUS

PDF

135.3 KB Created: 2021-03-30 17:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54a1203d6a4c27543c2a8b2be571c9be SHA-1: 7637dd92c16105370a894ca67971d9dce7f20cf9 SHA-256: 5c9399755c5aea30b7b4ec967c77acb0ba8deb1dabf0e95c22fa8af6c8754489
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to SEO-optimized content farms. One prominent URL, 'https://dafemum.ru/award?keyword=burmese+alphabet+pdf', suggests a lure to a malicious site. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/award?keyword=burmese+alphabet+pdf
    • https://cdn-cms.f-static.net/uploads/4383688/normal_60245dcfb9e2d.pdf
    • https://fitikelamo.weebly.com/uploads/1/3/4/6/134668278/delozumogixumozarero.pdf
    • http://betabudon.iblogger.org/accme_logo_guidelines.pdf
    • https://wiraxupafetob.weebly.com/uploads/1/3/2/6/132696263/bebuzexugosi_pavaxozeva.pdf
    • https://jewefero.weebly.com/uploads/1/3/1/3/131383264/9286904.pdf
    • https://nojamatisi.weebly.com/uploads/1/3/1/3/131384142/6460719.pdf
    • https://dutilugamon.weebly.com/uploads/1/3/5/3/135301630/251108b.pdf
    • https://cdn-cms.f-static.net/uploads/4416128/normal_6031564f168e9.pdf
    • https://fomujozi.weebly.com/uploads/1/3/4/0/134016754/nakixofozisa.pdf
    • https://xonunomimir.weebly.com/uploads/1/3/2/6/132681278/b3e0ca50cd055ea.pdf
    • https://witowufagefalob.weebly.com/uploads/1/3/0/7/130738848/7aadec.pdf
    • https://lumixomenuvaw.weebly.com/uploads/1/3/4/7/134745504/5105752.pdf
    • https://vugopese.weebly.com/uploads/1/3/0/7/130739154/105755.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://banezisiwirasu.rf.gd/64875513855.pdf
    • https://uploads.strikinglycdn.com/files/5a268655-f6f8-4964-b977-e1f759e239e0/48106553019.pdf
    • https://uploads.strikinglycdn.com/files/a04087bd-2002-421e-9449-151a19758509/line_by_line_analysis_of_romeo_and_juliet_prologue.pdf
    • http://benepuru.epizy.com/ccie_sp_lab_workbook.pdf
    • https://uploads.strikinglycdn.com/files/3a26b041-9c3d-4b8f-ac11-4b1783e30043/how_to_connect_ipod_to_jam_speaker.pdf
    • http://milibelibagusez.epizy.com/consent_letter_template_for_gdpr.pdf
    • https://uploads.strikinglycdn.com/files/92949992-5502-49c8-8855-1028ca7b88ba/93804908735.pdf
    • https://uploads.strikinglycdn.com/files/91ca3040-fa2f-402f-86ba-8030dde8c232/fewuwodavuwuvanukus.pdf
    • https://uploads.strikinglycdn.com/files/1c23b3dd-348a-4ad5-b4ed-b06eaaee60a1/24357358727.pdf
    • https://uploads.strikinglycdn.com/files/ea38ad76-144d-47ce-a70c-d7dbe6e719c3/monster_slice_pizza_near_me.pdf
    • http://kuwemujureza.epizy.com/ramun.pdf
    • https://uploads.strikinglycdn.com/files/93414a98-dce3-404c-844a-d891055150a2/43162455125.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
    • http://scripts.sil.org

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015829.bin
3fb954af1aa146cec30d5f3cd8272140aebc8f47bd9acf8af571b8eb7fdca092		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15829 8496 bytes
font_01_sfnt_off00017438.bin
6c8a103ea9ddf5af7c594b246780c34ccbc1564f20eec61f595670b926d372bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17438 5472 bytes
font_02_sfnt_off00018693.bin
6a0e550766a180d0f0f2b7d0cae4eed948e939e1bd6b31472fa28e991e8563b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18693 3056 bytes
font_03_sfnt_off00019365.bin
b8119ecc450749a2c491933b7b037eff99e61a9f62707b163fb87cae601c2f7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19365 18212 bytes
font_04_sfnt_off0001c7d6.bin
294b11dbfa39911c07adb524a76440679cbadd7557fca90ef9707c807b99b2a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C7D6 16176 bytes
font_05_sfnt_off0001dd2c.bin
3aeb4af7856951909128c40f4a0ccc24578f7881844dca8418e796062a67a868		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1DD2C 18052 bytes

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