Malicious PDF — malware analysis report

Static analysis result for SHA-256 db1720da44bdfa7f…

MALICIOUS

PDF

78.9 KB Created: 2021-02-28 16:57:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 13822b6d776ba511a76d00ff1c5a6a72 SHA-1: 73c23f55f5215f5d0c26e25775a752312a3d1637 SHA-256: db1720da44bdfa7fd549a34891db81b017f2099df4cffc9ce736a39338e2daf1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or a scam. The document body, though heavily obfuscated, suggests a lure related to salary information, directing users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/123?utm_term=average+salary+for+public+relations+and+fundraising+manager PDF link annotation
    • http://goldstein.capital/the_spy_paulo_coelho_amazonv7qd1.pdfIn PDF document text
    • http://dressnbuy.com/solabegabebefozgssw1.pdfIn PDF document text
    • http://hugertely.xyz/what_was_the_contemporary_civilization_of_mesopotamias2pb1.pdfIn PDF document text
    • http://arbitestpark.xyz/uniforme_colegio_san_agustin_antofagasta4yxnh.pdfIn PDF document text
    • https://cdn.sqhk.co/vafegijateno/iTgepja/rokosizepisawisitijewi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454822/normal_6013663ae392a.pdfIn PDF document text
    • http://wacc-cat.org/puloxudutaronafarevhej2p.pdfIn PDF document text
    • http://kleomaften.online/jenujigokuboba776xy.pdfIn PDF document text
    • http://instapriz365.site/calculus_early_transcendentals_briggs_free_downloadv9lvu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://midotujeg.rf.gd/79803082734.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/aeroplane_song_bestwap.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/eclipse_ide_user_manual.pdfIn PDF document text
    • http://nexovototato.epizy.com/c_o_kancharapalem_movie_songs_telugu.pdfIn PDF document text
    • http://rakimeramut.epizy.com/55281600589.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/xulovikoginuradatax.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AF 5764 bytes
SHA-256: b087b71aa0d1ee5c241052156035d3955eb72b316c315081ccb18a2c2b14846c
font_01_sfnt_off0001094c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094C 10668 bytes
SHA-256: 43212cc3764b80e54ca39e5203087d2c9b06c2d156648396370c5a0e40ad28ac

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