Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c31022bc2dc3c3b…

MALICIOUS

PDF

79.6 KB Created: 2021-02-25 08:17:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7d5475bc91f9efc608e3c1cd2945e962 SHA-1: c5d222222603db984763cf144ce54c8c7231da29 SHA-256: 2c31022bc2dc3c3b7095d735460b41f6b52ecaba59a68216b3f7eb2a8ef16391
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The presence of embedded URLs and the nature of the link farm suggest an attempt to direct users to potentially malicious or deceptive websites, possibly for phishing or SEO spam. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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 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.
  • 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://jacksth.ru/123?utm_term=what+is+the+wisdom+of+a+serpent PDF link annotation
    • https://gawofatofuwe.weebly.com/uploads/1/3/1/3/131380275/padirisorava.pdfIn PDF document text
    • http://domsale.xyz/andhra_pradesh_government_holidays_list_2018wsw2a.pdfIn PDF document text
    • http://eliyalte.com/2231296731025r4x.pdfIn PDF document text
    • https://zitidimesefe.weebly.com/uploads/1/3/1/6/131606065/1439b98.pdfIn PDF document text
    • http://lnstagramverifycentre.com/45260376963m7hhn.pdfIn PDF document text
    • http://ru-1.casa/transversal_and_parallel_lines_worksheet_answers_lesson_4-2o5oa1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500440/normal_602a025e7e04f.pdfIn PDF document text
    • https://simokatojerosu.weebly.com/uploads/1/3/0/8/130874490/tokoref_xasoka_fifisuxet_sopexupom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://terefikug.epizy.com/albinismo_genetica.pdfIn PDF document text
    • http://xabasib.rf.gd/sapadalubatisixawosa.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/html_css_javascript_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/25853245519.pdfIn PDF document text
    • http://nosigegu.onlinewebshop.net/40305596346.pdfIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/8668298673.pdfIn PDF document text
    • http://tirejazanapo.epizy.com/joxusofixasozatumosolarov.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/infection_control_guidelines_for_care_homes_wales.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/rokijik.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA4 5140 bytes
SHA-256: 216bb04f1f57d013fdf4ef88944f46906b173b569030794507403d69b2209813
font_01_sfnt_off0000ff08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF08 10552 bytes
SHA-256: d883f24453de805e421cfd785e3fce96d5fc8bd16adc2cc690d24d548f5cdff6
font_02_sfnt_off00012321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12321 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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