Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f8c3a773fdd5a18…

MALICIOUS

PDF

91.7 KB Created: 2021-03-14 15:32:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: faca71fe3ba0cec7638c331f1a7bc2e5 SHA-1: 1d9a085130bd6f90b61bb77221787a36020aee87 SHA-256: 6f8c3a773fdd5a18a5dde6f932c165ce6ab96bbc3d6dedcadee146980ad8cc3e
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to a link farm. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a large number of links, likely for SEO manipulation or to host malicious content. The primary external URI found, 'https://seumenha.ru/award?keyword=les+bascules+d+pdf', suggests a lure to a website. No scripts were extracted, but the structure and heuristics point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • 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://seumenha.ru/award?keyword=les+bascules+d+pdf
    • http://tetupamino.mywebcommunity.org/jabivewedesod.pdf
    • https://cdn.sqhk.co/nowavutu/eVHidig/ninja_warrior_shadow_mod_apk_free_download.pdf
    • https://cdn.sqhk.co/sunidoxil/YjhtjJl/woturekigeverepife.pdf
    • https://dulewidojupetor.weebly.com/uploads/1/3/2/6/132695372/sozemu_kugerus_xupin.pdf
    • http://fazejajogavu.medianewsonline.com/64918542775.pdf
    • https://tapajiwegunet.weebly.com/uploads/1/3/1/3/131380495/jomowikodofo_jefaxifilimake_xarekan.pdf
    • https://cdn.sqhk.co/roretuduva/hgFhblp/64766611526.pdf
    • http://zoxifowivo.iblogger.org/goxavapu.pdf
    • https://zufodivovogopot.weebly.com/uploads/1/3/1/3/131383523/mofinusuturosef.pdf
    • https://cdn.sqhk.co/pajugeluj/ihjXRja/samsung_galaxy_note_20_ultra_stock_wallpapers.pdf
    • https://zasevolonuto.weebly.com/uploads/1/3/5/3/135335071/4426376.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://vefagukolile.epizy.com/rubofexedenizisolukij.pdf
    • https://s3.amazonaws.com/fosawef/83971126698.pdf
    • https://s3.amazonaws.com/lodazojamuva/dekofigusewawisufup.pdf
    • https://s3.amazonaws.com/fipijife/android_studio_shortcuts_not_working.pdf
    • https://s3.amazonaws.com/zuguvoxoki/83036914238.pdf
    • https://s3.amazonaws.com/lopadivupudexa/declaracion_de_los_derechos_humanos_1948.pdf
    • http://kirubawebur.rf.gd/population_standard_deviation_ppt.pdf
    • https://s3.amazonaws.com/zatasipezeg/is_color_psychology_real.pdf
    • https://s3.amazonaws.com/kizugokofo/cd_envelope_template_ai.pdf
    • https://s3.amazonaws.com/sevoga/36072251191.pdf
    • http://wudazebej.atwebpages.com/retoxov.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010367.bin
8d7f0bc4d1225000d1c6ea7ecc3ebd9b833534358c082a998f1b4851a666b37c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10367 4672 bytes
font_01_sfnt_off0001134d.bin
74b008559acd90f64a932315b484c6d180ac7cc44dbf6a679fed6fde306313f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1134D 13136 bytes
font_02_sfnt_off00013ce7.bin
36abefe30a8cca52becf2d3bfe0d373c905c997ea1a72d737b5d2b25e28c6092		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE7 16136 bytes
font_03_sfnt_off000151d1.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x151D1 4324 bytes

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