Malicious PDF — malware analysis report

Static analysis result for SHA-256 a314afb0e25ef740…

MALICIOUS

PDF

73.7 KB Created: 2021-02-04 05:47:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d48b60b0218ce000505cdc0efca019ee SHA-1: e7b4ff923ac117e6f7dcea4dc41474e02f9cae9a SHA-256: a314afb0e25ef740ae4fe53a45501c05c7b080e10684fdf696ad5515f248fde1
126 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It contains numerous embedded URLs, including one that appears to be a link farm designed to redirect users to potentially malicious content, disguised as educational material. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest an attempt to direct users to compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://bologen.ru/aws?utm_term=math+worksheets+for+3rd+graders+free+printable PDF link annotation
    • http://godevibusaxinoj.22web.org/55171955666.pdfIn PDF document text
    • http://tobalalupuvobiv.iblogger.org/el_cristo_viviente_lds.pdfIn PDF document text
    • http://majelogajizivo.iblogger.org/incites_journal_citation_reports_2016.pdfIn PDF document text
    • https://referozudu.weebly.com/uploads/1/3/0/7/130775612/1813943.pdfIn PDF document text
    • http://bobiruropiles.22web.org/kalinka_sheet_music_brass_band.pdfIn PDF document text
    • http://serikanipesemo.iblogger.org/wawezelujidewu.pdfIn PDF document text
    • http://lodiped.iblogger.org/21800703582.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mujopoweter.rf.gd/contributory_factors_to_reported_road_accidents_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/lopeteb/wududidebonomokawosuzele.pdfIn PDF document text
    • http://jeburam.epizy.com/greased_lightning_drum_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/lotibabakuj/67811791123.pdfIn PDF document text
    • http://jegowijuvu.epizy.com/sistem_bilangan_bulat.pdfIn PDF document text
    • http://bizebiza.rf.gd/chain_guide_or_bash_guard.pdfIn PDF document text
    • http://zawagebojirowe.rf.gd/15571722904.pdfIn PDF document text
    • http://zebofazedixa.rf.gd/blister_packing_machine_working_principle.pdfIn PDF document text
    • http://lizuratudesaxop.epizy.com/bihar_katihar_weather_report.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/redfourth_chorus_songs.pdfIn PDF document text
    • http://dekuravimej.epizy.com/mirepowevaxisuno.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_off0000e093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE093 5768 bytes
SHA-256: b0d6ec9e799f92e8ded30ce178e9217b9ac2675cf16ff5a6333a3eab94b5636a
font_01_sfnt_off0000f44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44A 11040 bytes
SHA-256: 0d330a46f1042dfcc256b300a39c1567a61de5ef97f4c6fc0c19a125b1fd5c07

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