Malicious PDF — malware analysis report

Static analysis result for SHA-256 5028c1a3c6d28d2f…

MALICIOUS

PDF

69.0 KB Created: 2021-01-20 13:29:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e435ad4358b269672901d5264b2b44d9 SHA-1: eefc83f99fe90ce4500ed120b436bc9ac4b52b5a SHA-256: 5028c1a3c6d28d2fe685e61beb31fa09a0ea72e60212b4dd17f794ed90eaf7be
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, with one prominent URL pointing to 'maypoin.ru'. Heuristic analysis and ML classification strongly indicate malicious intent, with ClamAV specifically flagging it as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, contains text related to 'word whizzle beyond earth answer key', suggesting a lure to disguise the malicious nature of the links.

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://maypoin.ru/123?utm_term=word+whizzle+beyond+earth+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4443576/normal_5fa1cfa501335.pdfIn PDF document text
    • https://site-1177364.mozfiles.com/files/1177364/dunijaterufozodovoxarub.pdfIn PDF document text
    • https://gofolepoxi.weebly.com/uploads/1/3/4/8/134882907/pidebimuzujex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409628/normal_5f9afe5cd1fd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367925/normal_5f8c5d85124ae.pdfIn PDF document text
    • https://lofusomibebez.weebly.com/uploads/1/3/2/7/132740423/2716554.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409997/normal_5fb84700253a5.pdfIn PDF document text
    • https://site-1175491.mozfiles.com/files/1175491/rixarosi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411001/normal_5fa7e3288aac7.pdfIn PDF document text
    • https://dinurafilaxu.weebly.com/uploads/1/3/4/6/134621410/99d8038bd8645f0.pdfIn PDF document text
    • http://rewutudot.iblogger.org/information_report_introduction_example.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409409/normal_5ff1487a08c47.pdfIn PDF document text
    • https://site-1175635.mozfiles.com/files/1175635/across_age_2_cheats_xbox_one_backwards_compatibility.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444853/normal_5fe898525995b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383577/normal_5f9703cc7267c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/fewikonojukimatuzoze.pdfIn PDF document text
    • http://befojarariwowab.epizy.com/free_calligraphy_letter_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/dotted_line_reporting_benefits.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/formacion_de_placas_de_ateroma.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/activated_carbon_free.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_off0000d144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD144 5372 bytes
SHA-256: 4ee05d8a16b5435a17ebba16c707d7743afb38b6476de31c173c10f2290e004f
font_01_sfnt_off0000e3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AA 10232 bytes
SHA-256: 80d52ebcf8c270634fab7940306d2c38c159756651681c85f60f45207d9a75e2

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