Malicious PDF — malware analysis report

Static analysis result for SHA-256 08d8b086768d0b80…

MALICIOUS

PDF

68.0 KB Created: 2020-11-17 13:51:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d6614290196695d9a9bf23bbe0a0aa2c SHA-1: 74139782aeee56d66a6ad66979784a93d5a7248b SHA-256: 08d8b086768d0b807ebac52678643524bf4ab1827d9565f312e8bf3e51b440cd
214 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, with at least one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a tactic to manipulate search engine results or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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 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.
  • 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://gettraff.ru/strik?utm_term=dell+precision+wallpaper In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370555/normal_5f8c24f9c440b.pdfIn PDF document text
    • https://sivusemekatew.weebly.com/uploads/1/3/4/4/134491367/pinuvelimatad.pdfIn PDF document text
    • https://sanaxuruvumuvuk.weebly.com/uploads/1/3/1/4/131438582/lugikejalasujugosa.pdfIn PDF document text
    • https://wopadutizibum.weebly.com/uploads/1/3/4/3/134306931/seduf-pinomulapovuju-fuxodilugabeti-xupufisemogul.pdfIn PDF document text
    • https://sabidodavo.weebly.com/uploads/1/3/1/4/131408103/penexek.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/jazofi/kali_linux_wifi_hack_commands.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b71880f-bde1-426a-b187-19d4189295f9/fusad.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/diablo_3_demon_hunter_shadow_build.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16c05ec4-7843-40d9-9e8f-234fb28c04d7/39375771240.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8572d2b-b9cd-4426-b9b7-d68f51246aac/74388588561.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1c7ce03-f925-4622-a418-d38779ee101d/xasizebapabadol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1318f0b5-5574-4fc5-8a15-d38db7e1d01a/sipovasetesadojow.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB870 5016 bytes
SHA-256: be251ea79e60198018177f0ee4d00a4734cf8a6fcad450c5e5a90bdf07dd2458
font_01_sfnt_off0000c9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A7 10604 bytes
SHA-256: c0f7cdf6defb7f2433af1098db4943b880b837109f9f1e8c6a59d5024e90c3fd
font_02_sfnt_off0000edf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF9 16164 bytes
SHA-256: f469c5aa689aa4c1965481b78cfaebbf1c3ebdad2306c7067134b7b4aaa0addd

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