Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7449902c77b610d…

MALICIOUS

PDF

70.9 KB Created: 2021-02-28 08:33:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 50902a1dbf8765bfade8d214e3cdf2ad SHA-1: e21034cdf625967aa0de6094a771a959e405501a SHA-256: c7449902c77b610d1b4350eccb1d2de37a86ca18e5f102b98c32eda2837893ce
166 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely attempts to trick users into downloading a password-protected archive, a common tactic to bypass gateway scanning. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/strik?utm_term=ejercicios+de+estadistica+para+ni%25C3%25B1os+pdf PDF link annotation
    • https://cdn.sqhk.co/mujejadalale/2gcUUjh/jewels_star_3_uptodown.pdfIn PDF document text
    • http://xejepurefe.scienceontheweb.net/panasonic_sr-3nal_1.5-cup_automatic_rice_cooker.pdfIn PDF document text
    • http://vadosixajobirug.mygamesonline.org/67865680312.pdfIn PDF document text
    • http://leledup.mypressonline.com/debiz.pdfIn PDF document text
    • https://cdn.sqhk.co/difigobon/hgVimSp/smilodon_rampage_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/wodabumamuv/cghJibj/42337166749.pdfIn PDF document text
    • http://nekuwagibajese.getenjoyment.net/qsc_gx3_power_amplifier_300_watts_reviews.pdfIn PDF document text
    • http://nipokaxa.getenjoyment.net/cold_calling_techniques_by_stephan_schiffman.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zowiseli.epizy.com/lajaturulor.pdfIn PDF document text
    • http://rugeritubaduw.epizy.com/29159855021.pdfIn PDF document text
    • http://bixixus.epizy.com/bogufowabewig.pdfIn PDF document text
    • http://kezijewuzal.epizy.com/espn_dallas_cowboys_injury_report.pdfIn PDF document text
    • http://jujageritoxo.atwebpages.com/how_to_translate_arabic_to_english_in_google.pdfIn PDF document text
    • http://pexevogawi.epizy.com/how_to_start_html_project.pdfIn PDF document text
    • http://jozobudesurarab.onlinewebshop.net/alita_battle_angel_2019_imdb.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_off0000d4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BD 5360 bytes
SHA-256: 28964cb9640340374a7fb917ac5e7cd804fb98b45adb2e32295193aa132ecf3e
font_01_sfnt_off0000e6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D1 11468 bytes
SHA-256: 0089eba19ed91176bead7c21f2ab014d7e0a767404d87b5ce106af4f709b5061

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