Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e5e4f722cfceec…

MALICIOUS

PDF

77.5 KB Created: 2021-02-21 22:59:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 4f454f318b6628944be9eba527b4a47a SHA-1: ccafd3b37a7e8251b264d3b2696a88e231459bba SHA-256: 28e5e4f722cfceec8dcd021876a43b232f520f033baeaf2ffa6c9709d7dd6e33
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV. It contains a large number of embedded URLs, many pointing to disposable domains or link farms, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to chemistry, which may be a lure. No scripts were extracted, but the presence of numerous external links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=why+is+acetone+more+polar+than+hexane PDF link annotation
    • http://insurerhome.ru/chefdom_mod_apk_android_1qkrn9.pdfIn PDF document text
    • http://alsamcctv.com/zulesolinoxr7cbk.pdfIn PDF document text
    • https://nimaxosonoj.weebly.com/uploads/1/3/4/8/134897368/bavinurerezofir_rerimawiwutu.pdfIn PDF document text
    • http://xipuxolidumix.22web.org/free_energy_pogil_answers_ap_chemistry.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421478/normal_5fe3f1e783f0b.pdfIn PDF document text
    • https://giboritozi.weebly.com/uploads/1/3/1/3/131379296/budoz.pdfIn PDF document text
    • http://naxawevuvesij.iblogger.org/36407875393.pdfIn PDF document text
    • https://bigonokefexix.weebly.com/uploads/1/3/4/5/134518339/7578394.pdfIn PDF document text
    • http://twobigs.space/zutiromadazouqpax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415770/normal_6021710ef3099.pdfIn PDF document text
    • http://tehnikator.ru/wezororiwubaxopapigj0g83.pdfIn PDF document text
    • https://cdn.sqhk.co/kawiwitifa/bBFnUcN/pixel_dinosaur_image.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497079/normal_5feb15e1b3cb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464524/normal_600d8afbe0579.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420454/normal_5fdca0e805495.pdfIn PDF document text
    • http://gufolosolikivu.22web.org/pureguzawitanududega.pdfIn PDF document text
    • https://cdn.sqhk.co/savujegu/iYgdVig/71478358928.pdfIn PDF document text
    • https://cdn.sqhk.co/josipinu/jbgfigM/zemibidilumaboruwow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473619/normal_602b2a1727d51.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dawutanarav.epizy.com/27740799380.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_off0000ed0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0F 5356 bytes
SHA-256: 18d6802641412f5819e8a5f66314003c9862ed3cec98594a82a33c9b1a51b22f
font_01_sfnt_off0000ff33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF33 12420 bytes
SHA-256: 39d198294f21e84b22e37316f2c33b51f5c85469533a872e0ecf7cf82998b18d

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