Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bb624668b2e8fcc…

MALICIOUS

PDF

99.1 KB Created: 2021-04-01 02:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 188ffe013f80a62e08935cc8e03d8709 SHA-1: b39616e45849c62485b9369516f76ac6e350b1ad SHA-256: 9bb624668b2e8fcc8938a76424e07b185ee5ffd51a0c5325ff1970da7504e45f
186 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 0.9994

Heuristics 6

  • 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.
  • 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.
  • 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/strik?utm_term=twilight+2008+full+movie+download+in+hindi+hd+720p PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4479718/normal_60282be5b360f.pdfIn PDF document text
    • http://dumubemajizukov.medianewsonline.com/artificial_neural_network_definition.pdfIn PDF document text
    • http://linodogeb.scienceontheweb.net/encyclopedia_of_modern_bodybuilding_arnold_schwarzenegger.pdfIn PDF document text
    • http://pusatokolerax.mywebcommunity.org/rpf_constable_ancillary_notification.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374360/normal_6029da3bb05be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475987/normal_605005ad62059.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385020/normal_600318bb42d14.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/23aeae99-bfa2-4880-8f63-994ded00d260/xivujofasebukonebules.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/lobidonexojoxivixizitile.pdfIn PDF document text
    • https://3d7c42e8-cad9-4196-8f3c-0f210fd97588.filesusr.com/ugd/1b7c00_96039726fdae4e37b7d693bbd0180ff3.pdf?index=trueIn PDF document text
    • https://ac65beef-1c88-4b01-a948-251493ed82f2.filesusr.com/ugd/09857b_a43047e1c80a4367bdebe2d57eebe1aa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kegovev/38250769289.pdfIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_0bdf9ada675b471394d9fc070d795fb5.pdf?index=trueIn PDF document text
    • https://e5b7f393-9b83-42c5-a877-5b85c0c772c8.filesusr.com/ugd/77b42d_639cc3a99de14d91bb693202a76ac364.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7185d741-5321-44a1-a4d9-a1cb0aab919e/54787583395.pdfIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_c79ef48ec7b9442e984e2202c4e3dc07.pdf?index=trueIn PDF document text
    • https://82f7a8bd-e2a3-46ec-bdf8-dd4727f017fb.filesusr.com/ugd/a90de3_835a6c7566224292b7b702db72b876ec.pdf?index=trueIn PDF document text
    • https://c24d0846-efa5-4754-a822-a7dc8f88f2d4.filesusr.com/ugd/7b2abd_c907e1265334494cb1e7a81e03d24615.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8b90c82-d9a4-4b35-a3b1-b1755b965d5e/89484088683.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbb2d589-ab5b-4673-8719-fe0bb5d099bd/what_is_the_significance_of_9_days_after_death.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF453 12104 bytes
SHA-256: a30a75f8e9658221be07d746f424e5dc0aed259228e15ab05e7f412c3015e940
font_01_sfnt_off00011be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE2 5832 bytes
SHA-256: ecdcebca6dbbc7b1d24ec3505143f03f23c8249a0c131fb7d1cfb6b1ab6ca826
font_02_sfnt_off00012fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBE 11708 bytes
SHA-256: 323b0a2990c5d071d806b141578ef297c319a9f4ea274b63cacd515385c405fd
font_03_sfnt_off000157da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157DA 16072 bytes
SHA-256: 4ce97752c8d1ed0b0302a1507788019c6b738cc3ee96ca273f61f92c287db7cd
font_04_sfnt_off00016c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C77 6052 bytes
SHA-256: 8fc1df2de3b9374ad3f547ee359cf29e69c17fd560bdd1e9e14bef8698531691

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