Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f54d9f75740b5d…

MALICIOUS

PDF

72.6 KB Created: 2021-02-18 16:47:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2d35c344e7705761a79fbee10c23e151 SHA-1: 902bbb9097b7611856c51bd147fbe0273a0303fd SHA-256: b8f54d9f75740b5dc35c43f9881da11ed257e68d8241967f9221b455bf5f029e
192 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links to external websites, with one specifically identified as a malicious redirector. The presence of a 'download button' heuristic and the ML classifier's high confidence score further indicate malicious intent. The document body, though heavily obfuscated, contains text related to 'Dell optiplex 9020 sff i7-4770 specs', suggesting a lure to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://yafferge.ru/123?utm_term=dell+optiplex+9020+sff+i7-4770+specs In PDF document text
    • https://cdn.sqhk.co/vexedobasof/Ehhhiie/spanish_story_book_for_beginners.pdfIn PDF document text
    • https://nerilumasufut.weebly.com/uploads/1/3/1/4/131437044/pipap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365560/normal_601b668621947.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485313/normal_602540762394b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nasukenapab.epizy.com/three_fund_portfolio_performance.pdfIn PDF document text
    • http://pomezup.epizy.com/sudoku_printable_worksheets.pdfIn PDF document text
    • http://tijejawoporufil.epizy.com/free_template_for_business_cards_blanks.pdfIn PDF document text
    • http://rorulapuvutoj.epizy.com/35587495097.pdfIn PDF document text
    • http://zamoguwudegovo.rf.gd/88666392901.pdfIn PDF document text
    • http://jewojov.epizy.com/technical_design_document_template_sample.pdfIn PDF document text
    • http://tubagawidi.epizy.com/actonel_combi_d_information.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/information_about_atticus_finch.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/9385781057.pdfIn PDF document text
    • http://wevedikelu.epizy.com/fender_guitar_serial_number_guide.pdfIn PDF document text
    • http://kotumeberi.rf.gd/music_beat_maker_apk.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA95 5400 bytes
SHA-256: 20a68aaf4c1c3a18592ec91b56fa31bd8902020d3f0e03260932a58ecb76a4a9
font_01_sfnt_off0000ed36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED36 11816 bytes
SHA-256: c2faf9617d65a0997438f167d229d87f7fa1b15c89f7728721f23d2a463db0db

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