Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c8394fd4cab205…

MALICIOUS

PDF

80.9 KB Created: 2021-03-28 12:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93d617a52e0d87a878edb51138111cb0 SHA-1: 697cde9988ff4ee1b215c14584c7fc759f7530ed SHA-256: a3c8394fd4cab2058c6f522972581c70cfa64fb8efd35a06a5ba0572c7f9cb16
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm designed to direct users to various PDF documents. One of the primary URLs, 'https://pelibifir.ru/strik?utm_term=are+there+any+promo+codes+for+allegiant+air', appears to be a lure for phishing or malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing a secondary payload.

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-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://pelibifir.ru/strik?utm_term=are+there+any+promo+codes+for+allegiant+air
    • http://volosaty100.xyz/7310415144524dl6.pdf
    • https://losikopak.weebly.com/uploads/1/3/4/6/134616488/1293438.pdf
    • https://logikepuni.weebly.com/uploads/1/3/4/4/134459966/99639f9.pdf
    • https://dolunejasuvufa.weebly.com/uploads/1/3/0/7/130776008/wapezaxam_givoju.pdf
    • http://funseeds.site/the_art_of_communicating_thich_nhat_hanh_free_downloadkuwzf.pdf
    • http://italywow.info/bully_apk_data_apkpure8y6pr.pdf
    • https://xorewodanuvidiw.weebly.com/uploads/1/3/1/3/131381095/riveb-rirevazorelag-sirewawosogogu.pdf
    • https://vesetiwavulajed.weebly.com/uploads/1/3/1/3/131381055/teboravotim.pdf
    • https://wagigezo.weebly.com/uploads/1/3/0/7/130775958/nexalowisefa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pujirageg/my_talking_tom_2_for_pc.pdf
    • https://d86ad34a-7df2-4f47-937b-a12ab5abc0fa.filesusr.com/ugd/8cbfce_31878910ff4d48eba307612af4cd2dbe.pdf?index=true
    • https://s3.amazonaws.com/wolina/cdc_flu_facts_sheet.pdf
    • https://s3.amazonaws.com/xijalovelokolep/36966387364.pdf
    • https://s3.amazonaws.com/rodakarugupoko/14333038678.pdf
    • https://66c7139a-03c0-45fe-98d3-e817d1e01442.filesusr.com/ugd/de2db5_6978b7a84a97451f84f3ecb7415fafa0.pdf?index=true
    • https://s3.amazonaws.com/batoragubukepo/88197599089.pdf
    • https://s3.amazonaws.com/donake/89293100158.pdf
    • https://s3.amazonaws.com/dafumuxitupav/dixetudilegitukini.pdf
    • https://s3.amazonaws.com/poguvelefa/peak_backup_camera_installation_video.pdf
    • https://31c8a3d4-0132-49f1-a04f-09c79d03e01f.filesusr.com/ugd/a4da84_19531d18b31c4654b487ea085a8505ad.pdf?index=true
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000faf9.bin
fdd742fde32b8db3c2672419a5454cb1bba0199d797ae166217fc7a468841283		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF9 5660 bytes
font_01_sfnt_off00010e1d.bin
8cdef902124728379836ef2960e7df24907ec6779ab798eeca8ffd2ead9e305b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1D 11312 bytes

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