Malicious PDF — malware analysis report

Static analysis result for SHA-256 43348510e3b6d926…

MALICIOUS

PDF

66.8 KB Created: 2021-02-28 08:08:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a13510de751d0b01c779bebb8d684dc1 SHA-1: 9e62962cf78eba5d5afb2287ed37d9a9bdccbeca SHA-256: 43348510e3b6d9265f6b304bc123b7e2d0e0dae6a2a1d3814d2ac20baa8cffeb
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links pointing to various PDF documents hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to distribute further malware or phishing content. The embedded URLs and the structure of the PDF are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8046

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 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
  • 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://dugedepap.ru/award?keyword=i+am+the+purple+guy+lyrics+youtube PDF link annotation
    • https://majivuwuwu.weebly.com/uploads/1/3/2/6/132683475/6218459.pdfIn PDF document text
    • http://healthytrands.com/jcpenney_sewing_machine_7057_partsfqw8y.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380707/normal_5ff45663f3d75.pdfIn PDF document text
    • http://help-lnstagram-verifycopyrgiht.com/synology_nas_admin_guidem42hg.pdfIn PDF document text
    • https://cdn.sqhk.co/fujotojaxob/8ggjahi/sling_blue_channels_espn.pdfIn PDF document text
    • http://liketime.online/39566140532vm3y8.pdfIn PDF document text
    • https://famonusowofem.weebly.com/uploads/1/3/4/3/134349488/4954545.pdfIn PDF document text
    • https://kisewosa.weebly.com/uploads/1/3/1/0/131070890/xopexowenipar.pdfIn PDF document text
    • https://soneputud.weebly.com/uploads/1/3/1/4/131411150/6876899.pdfIn PDF document text
    • https://masenajeronuzes.weebly.com/uploads/1/3/1/6/131637464/tegobazitorivasifo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458148/normal_601d2f7559b20.pdfIn PDF document text
    • http://thedouche.xyz/inference_worksheets_with_answers4ikb3.pdfIn PDF document text
    • http://trynutra.shop/33235194848azjjx.pdfIn PDF document text
    • https://fafetomipisiso.weebly.com/uploads/1/3/4/6/134603542/debuvevewa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387036/normal_601fcbc0d4e38.pdfIn PDF document text
    • https://cdn.sqhk.co/joziroluxu/1VheLhb/build_a_bridge_lyrics_limp_bizkit.pdfIn PDF document text
    • http://ipoteka.net/where_is_the_bluetooth_antenna_on_ps4z18p8.pdfIn PDF document text
    • https://cdn.sqhk.co/ketifoseja/cIVbHhd/3678707565.pdfIn PDF document text
    • https://xexajuxeleseg.weebly.com/uploads/1/3/4/5/134592224/vaxira-lipovo-tatiwupexin-tazubiku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE49 5300 bytes
SHA-256: 5cdd16ae48e3eeab689e798770432ac4265b014f8cba5979fe444b282bbade44
font_01_sfnt_off0000e051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE051 9580 bytes
SHA-256: 0b284f250fdc53dd4e6ca82c7c185d414645c7888c125945ff938a15e94c2980
font_02_sfnt_off00010115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10115 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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