Malicious PDF — malware analysis report

Static analysis result for SHA-256 27bbfa582f1409b6…

MALICIOUS

PDF

128.7 KB Created: 2020-11-20 03:43:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 587c5c0169066123cdd5b8279e1be92b SHA-1: 9deb7d398baba90c38235b366747540b96010d3e SHA-256: 27bbfa582f1409b63d0916a0dc86acb9e5ef01c230c31afa5e089c311a4ce8d3
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 0.9998

Heuristics 5

  • 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.
  • 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://traffset.ru/strik?utm_term=mgs+pw+weapon+guide PDF link annotation
    • https://ladasewesadil.weebly.com/uploads/1/3/4/6/134665294/timufowisal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372087/normal_5f88c28ce76ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368978/normal_5fab95f7343da.pdfIn PDF document text
    • https://joverukaded.weebly.com/uploads/1/3/4/4/134433057/rutatazemaletuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392193/normal_5f925e9d7519a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468554/normal_5fa3e162eca1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391326/normal_5fa5e7a1d1021.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/madegusulepugif/dvd_vcr_combo_on_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/87729648006.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e684aeb8-d9dd-43cb-a951-96ef3c510788/xifesad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3259fd34-07a4-4d52-8752-661f7935c9ba/17284604805.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/blue_wilderness_salmon_cat_food_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00a771b8-e534-472f-8dd4-710e3a2508b6/suzuki_piano_school_book_1.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/xewanijawobibalogiwunediv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb63f3f5-b968-4c2a-84dd-1cec9435f7c6/eric_clapton_before_you_accuse_me_1990.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c072b40d-3fed-4577-a35d-c513218fed89/24356911197.pdfIn PDF document text
    • https://s3.amazonaws.com/rowubunak/software_development_planning_template.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_off0001b194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B194 4900 bytes
SHA-256: 851a63ce116916cceed7e777d91f012d658eb0b56dd3c24c4a03c18c99b3d284
font_01_sfnt_off0001c262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C262 11640 bytes
SHA-256: 2a41c1cdfb0d1c88d8bbbf2c314495422edb6c36d69fb777bdabb1950cfa50bb
font_02_sfnt_off0001e7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E7C1 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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