Malicious PDF — malware analysis report

Static analysis result for SHA-256 68d81902ef751775…

MALICIOUS

PDF

83.3 KB Created: 2021-04-07 14:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d3903a77e500ff6f179b61f79bb6319d SHA-1: 95ac058c1657f9a82c95639f93590ceebc29a2a9 SHA-256: 68d81902ef751775dc627c2efec1728a979d8944395f6b2dafc7c878b1d75cbd
194 Risk Score

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lozipotod.ru/aws?utm_term=fifty+shades+darker+full+movie+download+in+hindi+online PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384650/normal_6040b1f905689.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408195/normal_600eb46a5bf8c.pdfIn PDF document text
    • https://nuvisinuxaxo.weebly.com/uploads/1/3/1/3/131383681/5103091.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483083/normal_5fce0ac864c77.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374360/normal_5fdf80a14576e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451377/normal_6047f068da0a8.pdfIn PDF document text
    • https://tonudekosinin.weebly.com/uploads/1/3/4/6/134685286/b623ed47.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501965/normal_5fdfb1ca46f72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445115/normal_5fd22e083d68c.pdfIn PDF document text
    • https://xikalevu.weebly.com/uploads/1/3/4/3/134319979/0705fc2f662.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455374/normal_600267f83353a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368759/normal_60542b2d9a4ee.pdfIn PDF document text
    • https://mofutobanu.weebly.com/uploads/1/3/1/3/131383854/ralixabiwam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gezizefefififa/whirlpool_refrigerator_not_making_ice_fast_enough.pdfIn PDF document text
    • https://28f2c00a-638b-45ec-8848-4d649cb6aba9.filesusr.com/ugd/946f28_720600417d2b47c4a5264e79a6fa3b05.pdf?index=trueIn PDF document text
    • https://11627308-8c8f-4f08-99ed-0ad85160907d.filesusr.com/ugd/682d1c_272d151ac63b411b8c89968793067726.pdf?index=trueIn PDF document text
    • https://73f4d879-981c-49fe-abc7-520f36a14a84.filesusr.com/ugd/b77b08_1e7b86ee971d45bfab518cddbfa46127.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/47078304590.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxefemebidaz/64832228118.pdfIn PDF document text
    • https://0ac950e2-707a-4e47-8bf4-daface0ea9db.filesusr.com/ugd/356f11_76efcffcab004dba96f01c7386a8c72c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cf2c210-6483-4652-bd14-770733fd2d4e/sowiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c7e72f6-136a-4279-979e-aafed20f7baf/can_i_buy_samsung_s9_plus_in_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/conducting_polymers_polyacetylene.pdfIn PDF document text
    • https://c534e673-b245-4a6d-8787-855fe96db707.filesusr.com/ugd/e19215_086eeafa24644c8eb9c52f6294aaab21.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef45697f-3890-427b-972d-d910f9e57b0d/20341900222.pdfIn PDF document text
    • https://s3.amazonaws.com/gapuruxumeg/what_is_stored_program_organisation.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF912 5300 bytes
SHA-256: 4ac1870910bf53cda3249dfd5ecbfb1d3bd570a5af9d83c9139990a2d526f661
font_01_sfnt_off00010b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B06 11120 bytes
SHA-256: 940c3dd1a922a503bb4017d35427410dc914b3acf371c4eb5a585acd897657f1
font_02_sfnt_off00013107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13107 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378