Malicious PDF — malware analysis report

Static analysis result for SHA-256 40fc61526d2a2b33…

MALICIOUS

PDF

120.2 KB Created: 2021-06-06 08:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99f3e09d4f9ffa777c1618a80fc6a1be SHA-1: 55ce7e74cf18fff7becccb1bde191de4480d339a SHA-256: 40fc61526d2a2b33d88c936b4898db6a79827c912549d4783ce01f2022e30ffe
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains an embedded URL pointing to a suspicious domain, synerhu.ru, which is likely used to host a phishing page or download a secondary payload. The document body, though heavily obfuscated, appears to contain metadata related to its creation, possibly to mask its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://synerhu.ru/pbw?utm_term=ensayo+sobre+el+mundo+de+sofia+pelicula+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nagomax.pbworks.com/w/file/fetch/144694257/fegimaver.pdf
    • https://uploads.strikinglycdn.com/files/3702c16a-3fba-4cb3-a518-f00607a74d85/99717568988.pdf
    • http://sisagexal.pbworks.com/f/gijonubaku.pdf
    • https://uploads.strikinglycdn.com/files/f33df12e-7623-4b3c-9c9b-a54feaaa24e1/the_courage_to_be_disliked_quotes.pdf
    • http://jifesepapo.pbworks.com/w/file/fetch/144557523/komunojazat.pdf
    • http://zufogopojut.pbworks.com/f/binejituwekedomorafaf.pdf
    • http://gomedaj.pbworks.com/f/66924537292.pdf
    • http://jiboduxoguv.pbworks.com/w/file/fetch/144506742/55219389193.pdf
    • http://medodadepud.pbworks.com/f/dopodiviroref.pdf
    • http://rorazokazog.pbworks.com/f/annual_performance_assessment_report_meaning_in_hindi.pdf
    • http://kevukimugo.pbworks.com/w/file/fetch/144674859/how_to_sterilize_spectra.pdf
    • http://gopidam.pbworks.com/w/file/fetch/144704856/what_to_eat_on_blood_type_a_diet.pdf
    • http://gudikijuruf.pbworks.com/w/file/fetch/144576330/76143903608.pdf
    • http://kafunujazuwo.pbworks.com/w/file/fetch/144526278/medimoxidalegofike.pdf
    • http://lorugaz.pbworks.com/w/file/fetch/144655896/gitileb.pdf
    • http://gorixose.pbworks.com/w/file/fetch/144615570/playmobil_victorian_mansion_5300_dimensions.pdf
    • https://uploads.strikinglycdn.com/files/a24aa290-12ab-430f-a63c-bc8e04745458/how_to_read_mq3000_fingertip_pulse_oximeter.pdf
    • http://wenuveraroto.pbworks.com/w/file/fetch/144708231/tenancy_agreement_template_free_download_uk.pdf
    • http://gibudufu.pbworks.com/w/file/fetch/144596097/1977_prowler_travel_trailer_owners_manual.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001984d.bin
bab5f53032fb773e02c1bb6af18956745f0dafb090c51e930cfca142c6940c09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1984D 5500 bytes
font_01_sfnt_off0001aaf5.bin
621c7b20f6df5724216c99c5d37b1cd701ea78fc05dc305d4ddedc54a0b74b1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AAF5 12316 bytes

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