Malicious PDF — malware analysis report

Static analysis result for SHA-256 f427b28d38e23717…

MALICIOUS

PDF

74.3 KB Created: 2021-03-09 04:02:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6d7042eeae310896a6f00878f5dfea6b SHA-1: 5a1b807b9599f728461774b02d9b22db02494fc3 SHA-256: f427b28d38e237178aacb0f43102a0327bb0346f92de60315173771b3afd8d71
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/123?utm_term=cover+letter+sample+pdf+kenya PDF link annotation
    • https://deponoma.weebly.com/uploads/1/3/2/6/132696267/dujegajipe_lamukitu_toretolosisaka_sujufivalo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446045/normal_601adea323b34.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvupalib/ghghQ6p/chiq_retro_fridge_white.pdfIn PDF document text
    • https://cdn.sqhk.co/tovipovo/EIgi4ge/66693674429.pdfIn PDF document text
    • http://pezidibega.iblogger.org/jezij.pdfIn PDF document text
    • https://dejuxowiku.weebly.com/uploads/1/3/0/7/130738850/1095075.pdfIn PDF document text
    • http://jezefumivodasaw.22web.org/pisisidaxezowatupokof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478687/normal_601380b3f032f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/9754937988.pdfIn PDF document text
    • https://c78ffd2e-fc3d-4272-86ca-968d835fb7ad.filesusr.com/ugd/0f9ef0_617d880ce6cd4136b63382ebddc33998.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/math_worksheets_for_grade_3_multiplication_and_division_word_problems.pdfIn PDF document text
    • http://gedonisezif.epizy.com/hello_baby_monitor_user_guide.pdfIn PDF document text
    • http://sesugemedolaf.rf.gd/9997746641.pdfIn PDF document text
    • https://9e7b01ce-91ce-414a-93c5-ade8df4b7359.filesusr.com/ugd/cfbfd2_7ef5fe56888940229e10af423b022f37.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/gitivaropura.pdfIn PDF document text
    • http://gesesasogibigaw.rf.gd/math_addition_worksheets_up_to_20.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78F 5320 bytes
SHA-256: 56179268a1db011b5f294d0ba18eb99d34d22dcdb352e10987d8a11555532984
font_01_sfnt_off0000f99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99B 10152 bytes
SHA-256: f8e2e5bd50081db6ad81859e59688e05dc03ae3e0f69908e8d9ba34e6c6b6942

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