Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c1126c0b1970c26…

MALICIOUS

PDF

78.8 KB Created: 2021-04-15 11:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f55cd50e18dbc5a1eaad1c079d4da3df SHA-1: 717d1f563b36cf9d72b238c974c3bdd66e072180 SHA-256: 1c1126c0b1970c26deab82320d375b2f513fcb7f7ace7816319eb41cc1ff417c
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm or redirection scheme to host malicious content. The document body, though partially corrupted, contains text related to a school calendar, likely a lure to disguise the malicious intent. The presence of external URIs and the overall structure strongly indicate a phishing or malware distribution attempt.

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://druttle.ru/strik?utm_term=ciclo+escolar+2019+a+2020+calendario+sep+jalisco
    • http://kraftmann.su/70583484596sqxxc.pdf
    • http://skidki-day.site/92800474307i86dh.pdf
    • http://tiwelonepozafuw.iblogger.org/fiddle_faddle_sheet_music.pdf
    • http://tuduvodakep.mypressonline.com/how_much_does_a_pacsun_employee_make.pdf
    • https://static.s123-cdn-static.com/uploads/4485689/normal_5fc7d12984f82.pdf
    • http://logusubunovad.22web.org/nusikaz.pdf
    • https://cdn-cms.f-static.net/uploads/4408174/normal_6065b1e5a8142.pdf
    • http://reduslimitalia-official.site/mibaxosidibewosusesf82.pdf
    • http://kemedejovon.getenjoyment.net/fugare.pdf
    • https://cdn-cms.f-static.net/uploads/4369629/normal_600ecd9c0145c.pdf
    • http://jawunedizora.iblogger.org/seredawezo.pdf
    • http://presentinsta.online/weider_8630_manual_espaol8l7jt.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/livivuvuwugeb/99963925499.pdf
    • https://s3.amazonaws.com/lewuli/27534465248.pdf
    • https://s3.amazonaws.com/julaxel/69283661866.pdf
    • https://uploads.strikinglycdn.com/files/516b8195-de74-42df-8494-854c1156413b/40939076021.pdf
    • https://s3.amazonaws.com/fonazuzixagizir/luxeg.pdf
    • http://jasikadavasa.epizy.com/80062558716.pdf
    • https://uploads.strikinglycdn.com/files/2923a1e5-b735-476a-9e9d-bdbd84af2555/doserodopujivekatev.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e56d.bin
d9ebc44f2b6ed231544681173ecd0c332b13609c7fa66e97ef8388f58cc83bc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE56D 5356 bytes
font_01_sfnt_off0000f79b.bin
870ab62a79955a93ca636ea3c6b656ff615d002b0bb6b43f1db54027aa5b4ba9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF79B 11852 bytes
font_02_sfnt_off00011df8.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF8 4324 bytes

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