Malicious PDF — malware analysis report

Static analysis result for SHA-256 c24603b6e7f670a1…

MALICIOUS

PDF

81.0 KB Created: 2021-04-04 14:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ada6c281ab53e6f09c6a3e1a503d1210 SHA-1: 8d8b29d7229275e60ef18439e083567ef215610e SHA-256: c24603b6e7f670a1a87c7dec7a03d199735332fb9eeb0e91c7ece8f7cda5b9c5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9980

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://dafemum.ru/wix?keyword=web+surfing+science+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383805/normal_6061d6ee6a365.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419654/normal_604d0d9397a18.pdfIn PDF document text
    • https://jimutovila.weebly.com/uploads/1/3/1/8/131856698/xubedafonuwe.pdfIn PDF document text
    • http://gallery-shop.site/55390463494dgjp2.pdfIn PDF document text
    • https://pagazamis.weebly.com/uploads/1/3/5/3/135310118/2fd0136439.pdfIn PDF document text
    • http://tersq.space/asus_strix_b350-_f_gaming_manual5l34t.pdfIn PDF document text
    • https://ximazaka.weebly.com/uploads/1/3/2/7/132712593/8694818.pdfIn PDF document text
    • https://poximixej.weebly.com/uploads/1/3/0/7/130776069/zevoxidawovitow.pdfIn PDF document text
    • https://tewabigonin.weebly.com/uploads/1/3/4/7/134760563/guxozopir.pdfIn PDF document text
    • http://shopmzm.site/besodexikevewokixuvexo7xuqe.pdfIn PDF document text
    • http://goossyy.online/commando_2013_full_movie_1080podmmc.pdfIn PDF document text
    • http://form-lnstagramcopyrightservices.com/html_and_css_editorcljju.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
    • https://s3.amazonaws.com/rimejiguvif/bofimivifegigim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bced6d7f-d4e5-485d-bb32-fc6c7eb3227f/which_wireless_dog_fence_is_best.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c83afaf2-8d70-4e16-83be-53e3dd14fbab/brother_mfc_j615w_ink.pdfIn PDF document text
    • https://s3.amazonaws.com/jezekemunidup/biphasic_waveform_ultrasound_radiology.pdfIn PDF document text
    • https://c69a8150-bb1e-4c46-878b-fc1622391bd7.filesusr.com/ugd/cf91d6_5f3707baaf504db0b24b3869022cd010.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1a10171-e925-4f48-9597-d27be4e42216/fitatepabexagevekewenatu.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/nalalibomokotidovo.pdfIn PDF document text
    • https://84bd2c60-91d0-47b6-9565-6ae8a6593e58.filesusr.com/ugd/963627_71ab901011564c3eac8aec25497029c9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/purufiz/nail_shops_on_western_near_me.pdfIn PDF document text
    • https://ee42ee57-4547-4a8c-8a66-6cccb7f6869d.filesusr.com/ugd/2a9ad2_3b96ddd27524400fbbc2e4d3bb94fa4b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/midipes/donation_page_html_template.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB01 4952 bytes
SHA-256: 3a2a82405fd765e56b4fdb37b3d82efd712935f5fb5e89357f173f0592116caa
font_01_sfnt_off0000ebf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF8 10892 bytes
SHA-256: c851ce952bfb55782f6da151e0707e46970e0d0bd6a7606fc3da8387a34a04e5
font_02_sfnt_off00011132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11132 16180 bytes
SHA-256: e4e5ff3a026ebd78b19420afc0c9f27a5aa7a2a0b375c1fad9bdfa5bb8f0bd2b
font_03_sfnt_off0001264a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264A 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176