Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf2f8835a7964ab5…

MALICIOUS

PDF

76.8 KB Created: 2021-03-22 17:26:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f09a8b98972602a678cb17f60dac1483 SHA-1: 5a498c324030860537b89af4647503f0a910982b SHA-256: cf2f8835a7964ab5f98dc87755aa74d8a12ee3f76f27f71deb3b94e895b36816
186 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 0.9997

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
  • 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.
  • 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://jottigo.ru/123?utm_term=nature%2527+s+cancer+fighting+foods+pdf PDF link annotation
    • http://freshnatur.fun/sivibiludutemogulobawu64r8x.pdfIn PDF document text
    • https://sevexuwajewedov.weebly.com/uploads/1/3/4/5/134508994/lotap-lofod-papatobaj-pinalidotede.pdfIn PDF document text
    • https://vezutokabev.weebly.com/uploads/1/3/4/7/134758566/mapigibo-sikemo-limuwir-vusisivisubusat.pdfIn PDF document text
    • https://nonegisetuku.weebly.com/uploads/1/3/4/8/134877303/764cc088.pdfIn PDF document text
    • https://samirimirusa.weebly.com/uploads/1/3/0/8/130814124/buzebuxexabuvudidu.pdfIn PDF document text
    • http://milatepe.medianewsonline.com/lei_do_simples_nacional.pdfIn PDF document text
    • https://xujopikaxatanow.weebly.com/uploads/1/3/4/8/134850499/namokirilunifa-nilupevuderubo-toguvul-nugap.pdfIn PDF document text
    • https://tavabaxo.weebly.com/uploads/1/3/1/0/131071290/36e6c93a7e.pdfIn PDF document text
    • https://depewezuluro.weebly.com/uploads/1/3/4/1/134108544/e06cb9.pdfIn PDF document text
    • http://graatorama.fun/pavafosejev1nsxl.pdfIn PDF document text
    • http://fitdieta.com/dagurozezutomowiniwivasiw0oih1.pdfIn PDF document text
    • https://vipegiwofavagob.weebly.com/uploads/1/3/5/3/135302795/f77cf723.pdfIn PDF document text
    • http://podarokinsta365.site/297696884344elsx.pdfIn PDF document text
    • http://heleogose.online/34101828586bsd8t.pdfIn PDF document text
    • http://zaxevef.getenjoyment.net/92497635463.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://781b76d0-895c-4d4e-90f3-491762fad171.filesusr.com/ugd/894952_2085e501a8f549b38e32b9b010b20ed7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/007fb4c5-10a7-42ef-a718-8c8d3dcd6c04/dead_aid_dambisa_moyo_quotes.pdfIn PDF document text
    • https://c79dcb07-c1b1-4d84-a600-6417d8bf0f54.filesusr.com/ugd/edce22_6abc499979ed4a58b420c60744bb60ad.pdf?index=trueIn PDF document text
    • http://widusop.atwebpages.com/adobe_reader_for_pc_free_download_windows_10.pdfIn PDF document text
    • https://5f8b0e40-2141-4341-98ab-6145db4b8156.filesusr.com/ugd/2072cd_5bea1b9220774a06a21873df5618c354.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cfac8b3-a8ce-4ca5-b7ed-b9ab7786b0f1/75883673374.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_off0000ef7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7E 5388 bytes
SHA-256: c68e6acb66a0e0b704f6a6b859aae34c6c5b6a2e395e16595c6008db4c8ac057
font_01_sfnt_off000101d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D7 10528 bytes
SHA-256: 6b115323f05031dff9916f77f7aae00e70667a9077a9b2a49f5aa06856da91cb

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