Malicious PDF — malware analysis report

Static analysis result for SHA-256 5051d444c23195fa…

MALICIOUS

PDF

79.3 KB Created: 2021-03-31 22:33:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b44c853ef8adda53f14cbd04009b8845 SHA-1: 9056fdd92db19fb9213dea18c9fc657f94e8d98a SHA-256: 5051d444c23195fa0869768a93b39a62560192b4b170c9ca1b7f2207aaefcda1
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a large number of external links, many hosted on disposable domains, suggesting it is part of an SEO link farm designed to drive traffic to potentially malicious sites. The embedded URL and the document body's reference to "final exam schedule" likely serve as lures to trick users into clicking these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://kuzutuzo.ru/wix?keyword=final+exam+schedule+berkeley+spring+2018+schedule PDF link annotation
    • https://posilukununafux.weebly.com/uploads/1/3/4/4/134498017/zekedap.pdfIn PDF document text
    • https://pixereboxos.weebly.com/uploads/1/3/1/3/131381799/faxaxaludus-boluvo.pdfIn PDF document text
    • http://nizezoxizo.22web.org/manette_xbox_one_tablette_android.pdfIn PDF document text
    • https://zulasiromeg.weebly.com/uploads/1/3/1/4/131453934/fevuvimujaguweju.pdfIn PDF document text
    • http://buxozadogaro.22web.org/zibufididop.pdfIn PDF document text
    • http://pozonewexoz.iblogger.org/vadidugubiv.pdfIn PDF document text
    • https://wegudogixudefup.weebly.com/uploads/1/3/1/4/131438345/vuvabanapabiveginuwa.pdfIn PDF document text
    • https://visofamawuri.weebly.com/uploads/1/3/2/3/132303269/bixizetavidipefikime.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://4465b75e-e642-4f53-8c89-e22f0b9d4994.filesusr.com/ugd/ecd213_306111f327f446b8bffdce2643df7d76.pdf?index=trueIn PDF document text
    • https://02796127-04ec-4c85-b270-c6f7310ebb18.filesusr.com/ugd/ce0e6d_4ced87ec368c4696905d254eb8f5072c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd5795f2-7d65-416e-9485-7aeef70992d8/add_mp3_to_garageband_ios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9ef8562-90be-445b-8078-8f75554c73f2/parental_stressor_scale_neonatal_intensive_care_unit.pdfIn PDF document text
    • https://6a1e2a5f-c456-4288-b9d5-5378f87870fb.filesusr.com/ugd/076fac_cab0568502d44fb9b76dec6e705f5cbb.pdf?index=trueIn PDF document text
    • http://zopaxavebalopa.epizy.com/what_are_the_effects_of_volcanic_eruption_on_humans.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66dec25b-0277-4edd-b8b2-e8badeec1473/samsung_smart_remote_bn59_not_working.pdfIn PDF document text
    • http://nuzavaxevarap.epizy.com/88027668696.pdfIn PDF document text
    • https://b3e719cc-30df-460f-a5cd-d2fa480fcfac.filesusr.com/ugd/b2b6a5_b93cdd4adad54b93b6c1d44891beae91.pdf?index=trueIn PDF document text
    • http://xoxejafomi.rf.gd/wjz_13_baltimore_news_reporters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/811f4130-b1bc-4efc-a9da-a0719db847c8/vopavukesanutenev.pdfIn PDF document text
    • http://ruzojonawa.epizy.com/77668983124.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/996712bf-7406-4345-8999-a9aefc5fe434/how_to_cook_corned_beef_brisket_in_a_roaster.pdfIn PDF document text
    • https://91313464-3f42-441e-b0e8-b27065d471ad.filesusr.com/ugd/ee9d3f_01716ecea5c14b82b3e60f79e4bce1f8.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_off0000e60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60A 6028 bytes
SHA-256: f6940526d59b88fb24f3c46dafa8d4b06db7f5ef58b327adf38858beb20a2ca4
font_01_sfnt_off0000fa56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA56 10840 bytes
SHA-256: 32b6024457b943f7e0d092ac12fb384c0a030eb8e2ca5c6f881bd792ec9f5f68
font_02_sfnt_off00011f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F94 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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