Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c20127fcd5b0b43…

MALICIOUS

PDF

81.5 KB Created: 2021-05-20 15:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 28ece0d148a7a39f12f7452b90a09c62 SHA-1: 8c52d897d3d041f78ff7bd7dddb5b4cdf74d81d3 SHA-256: 5c20127fcd5b0b438e2f0aec6877cabde36c8a4e6b37759c69926ef4dfb48f7f
156 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 0.9991

Heuristics 5

  • 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.
  • 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://fokemale.ru/strik?utm_term=how+to+check+stimulus+update PDF link annotation
    • https://nazewaraja.weebly.com/uploads/1/3/5/9/135959380/vanexepewemumim_xosulemafitunig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410976/normal_600a4182193f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495034/normal_6045e592d91e8.pdfIn PDF document text
    • https://wemivera.weebly.com/uploads/1/3/4/3/134311686/7d7d40b45160ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445128/normal_6061f6efe60ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482415/normal_60595784e794f.pdfIn PDF document text
    • https://gemumumesuligiv.weebly.com/uploads/1/3/4/3/134318519/62bc8a3264625e4.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://uploads.strikinglycdn.com/files/866eddd9-1935-49b6-8977-f39a4f965ebc/how_to_install_ink_cartridge_hp_deskjet_1512.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddedffab-d1eb-409c-91f9-375abd09b7b5/41070949969.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/3413354532.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/bivumonumeda.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/xulase.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41305c29-8152-4667-835b-f4ff78184967/1__7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2a944a6-1170-4319-970c-7ac6293453ca/6mm_creedmoor_load_data_berger.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/you_again_2010_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/audit_checklist_excel_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6ea7b7a-726d-4efc-a76c-2d0b8941fb7b/have_a_new_kid_by_friday_podcast.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/how_to_apply_hair_dye.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30389234-b71a-499c-b1d0-67c0b4fe1e6c/fovufusa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfe5fd37-03b0-49a0-af7c-da4d1027b8e4/53108213350.pdfIn PDF document text
    • https://s3.amazonaws.com/futamo/what_ply_is_caron_simply_soft_yarn.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/90981153544.pdfIn PDF document text
    • https://s3.amazonaws.com/gusule/tipajaregapak.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_off0000f233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF233 5112 bytes
SHA-256: 9f409a2f9f8fb6f110407c7b2c3d8920136dc6b259479284c5966b376ca89c30
font_01_sfnt_off000103a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A3 11324 bytes
SHA-256: d6e0da3cc95072c68f83f3e70d0c35085891173c0bc8117c4f3cda6076063b94
font_02_sfnt_off00012a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A35 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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