Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bb4a1d3c1f85d0f…

MALICIOUS

PDF

74.7 KB Created: 2021-01-20 09:59:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 47cf3d600f9855d79066bfa7deb776dd SHA-1: 809da39c82be1fa3f55fedb6da2caa64089f80a9 SHA-256: 2bb4a1d3c1f85d0fedef09d34590564cf6335805ea81779458ce458fd5dfa3a2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm by heuristics. ClamAV and ML classifiers identify it as malicious, specifically a phishing or trojan variant. The presence of external URIs and the link farm heuristic suggest the primary purpose is to redirect users to potentially malicious content.

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://trafficel.ru/123?utm_term=purple+rope+lights+lowes PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4471692/normal_5fee91396596d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375690/normal_5fc1dbb8094de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409796/normal_5fd11f71d78fb.pdfIn PDF document text
    • https://cdn.sqhk.co/vipikunowi/ib0Zjpf/chemical_element_table_t.pdfIn PDF document text
    • https://gomadiwisedewun.weebly.com/uploads/1/3/5/3/135314557/dojonozix.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/hjbjpjj/hockey_quiz_questions_and_answers_2019.pdfIn PDF document text
    • http://remumajisipiv.66ghz.com/business_accounting_and_finance_tony_davies.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490116/normal_5fb2f5df1b56b.pdfIn PDF document text
    • https://cdn.sqhk.co/xotabuti/ib8jcji/xuboxonekudogobapufax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368998/normal_5f918335adc39.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://verirajoxa.epizy.com/handover_report_letter.pdfIn PDF document text
    • http://xivubijorudi.epizy.com/46112127089.pdfIn PDF document text
    • http://dodujorumapide.epizy.com/ideal_gas_law_density_worksheet.pdfIn PDF document text
    • http://benepuru.epizy.com/dowry_doraemon_game.pdfIn PDF document text
    • http://zepenolewiri.epizy.com/25975551862.pdfIn PDF document text
    • http://fofuxolisemaxim.epizy.com/windows_defender_windows_10_free.pdfIn PDF document text
    • http://jajoxutevo.epizy.com/2267139189.pdfIn PDF document text
    • http://gumigojozupe.epizy.com/sujuwok.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_off0000e8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FA 4964 bytes
SHA-256: 5b4ec06e043e545192315c2d111705d9018b6c908181ded5d3a05697bd56b1e3
font_01_sfnt_off0000f9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EE 10472 bytes
SHA-256: 811d2dbca470d42cd42ef48b06bdad0dcf64ed4638696108c7ab118f95e0ce0b

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