Malicious PDF — malware analysis report

Static analysis result for SHA-256 de12d3f35a8778d8…

MALICIOUS

PDF

80.6 KB Created: 2021-04-23 04:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b427db32f6182d33e2b7ece771db8495 SHA-1: 18bd4a8534398c29a660e0e5954bb16188864f20 SHA-256: de12d3f35a8778d87699ab9d75aaa7c4025433ffe7b8696197661f53214632fa
186 Risk Score

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 0.9990

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://resalured.ru/strik?utm_term=sex+education+season+3+netflix+nz PDF link annotation
    • https://bugigubagide.weebly.com/uploads/1/3/4/5/134586777/09d51492c9e6.pdfIn PDF document text
    • https://nenojidadexodu.weebly.com/uploads/1/3/4/3/134351563/bowoledebetiman-zumijaraden-xeparoj.pdfIn PDF document text
    • https://cdn.sqhk.co/feluxolid/jJwhhie/nidojosuvomozifoxiwes.pdfIn PDF document text
    • https://cdn.sqhk.co/sexuzoropa/XHhhuKi/jogatoko.pdfIn PDF document text
    • http://tirudibemaj.22web.org/direct_line_accident_report_number.pdfIn PDF document text
    • https://bexenexitefixu.weebly.com/uploads/1/3/4/7/134725849/8053175.pdfIn PDF document text
    • https://cdn.sqhk.co/vedanoderifu/hj1jiji/justice_rivals_2_cops_and_robbers_mod_apk.pdfIn PDF document text
    • http://kuvijuwe.22web.org/25486747065.pdfIn PDF document text
    • https://nuluziberalisox.weebly.com/uploads/1/3/1/3/131379655/pufewumuxe-gibixomijaxam-ginafunamavip.pdfIn PDF document text
    • https://dosedupuwosiwoz.weebly.com/uploads/1/3/0/7/130776272/fivat_xofumogoganafom.pdfIn PDF document text
    • http://pagexonani.iblogger.org/new_testament_church_of_god.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/Ehdjhjj/nicki_minaj_song_did_it_on_em_lyrics.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zofigofaka.epizy.com/4326028217.pdfIn PDF document text
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_9c283786209e4338aff41bfbe0d14590.pdf?index=trueIn PDF document text
    • https://684917c6-b594-4497-9ea4-141105166a5b.filesusr.com/ugd/0dc9f5_38e3ed8eefb6432ea2fddbcca6714ea9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf0e3b4a-9f39-415b-ba76-0ec617c93e2b/jobemelalomurilu.pdfIn PDF document text
    • https://3ced707c-20bd-49bb-93f1-edb15be4e391.filesusr.com/ugd/e90305_8235395f45e347daae637a80807f6ee0.pdf?index=trueIn PDF document text
    • https://ac263381-fdad-4fda-ae78-6df6d71032d6.filesusr.com/ugd/25c42e_ccb1494484204d2187617ad47c74985b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/21e02fbf-2f86-4342-a614-cb1ce88bbbb8/my_optimum_remote_wont_change_channels.pdfIn PDF document text
    • https://73c25812-7308-4b32-b985-10e2a25710ca.filesusr.com/ugd/5b604d_8e70c083154b4356afe5872603f63a76.pdf?index=trueIn PDF document text
    • https://40fd9d30-e691-4ad4-9ff9-7de67b304886.filesusr.com/ugd/45b27a_3cc24e2b207c4f8e94deb49c7e020863.pdf?index=trueIn PDF document text
    • https://0e75ab8e-f6a1-4360-bef2-1d94e06fde4e.filesusr.com/ugd/c0518c_5449621ea315431daaf6935035f7c9cf.pdf?index=trueIn PDF document text
    • https://12dd324c-696b-4d67-8c19-991f3eacec2c.filesusr.com/ugd/eeb7bd_23a50383d0b04adfb336a8f4143adab3.pdf?index=trueIn PDF document text
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_970d90d55bb44e329b7e5c8e14b34e83.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF26 5304 bytes
SHA-256: afdc3a9486caea876ce5da0e9ac0adc1ae9ed0543f35bfd12955c3fd5e4a82c3
font_01_sfnt_off0001014d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014D 2264 bytes
SHA-256: 4bf431f561edec4321ddd3b4e160987da77ff480a3efbd09e2e558d6156cbc82
font_02_sfnt_off00010b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B78 11716 bytes
SHA-256: eb9241b7af98a5e2583946b897978c2ae2b650c08052155e0e577d06bdec6d94