Malicious PDF — malware analysis report

Static analysis result for SHA-256 31da9cf0d147bbff…

MALICIOUS

PDF

71.6 KB Created: 2021-02-15 17:49:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: de0b9cfac1a15408d466923645766b81 SHA-1: 19fe51fe386ec1b0c8854b35b4d51147f24909cf SHA-256: 31da9cf0d147bbff2c1ef5020bac404eec4c4c4391fec76a94eb969a3b7eecca
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though partially corrupted, contains a title related to 'constitutional amendments' which is likely a lure to disguise the malicious nature of the links.

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://jottigo.ru/wix?keyword=par+guide+to+2016+constitutional+amendments PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417426/normal_60079ff34b605.pdfIn PDF document text
    • https://cdn.sqhk.co/kekotenonaxu/jawXvg0/87039874381.pdfIn PDF document text
    • http://uscarins.info/rikelezabuzabevuwn5hp.pdfIn PDF document text
    • http://urott-hu.com/just_basic_commandsg1lz8.pdfIn PDF document text
    • http://repair-foto.ru/movie_material_cast9f70o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499351/normal_5ff66fb30b484.pdfIn PDF document text
    • http://kyukty68.xyz/asuran_bgm_songs_masstamilan9syw5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479237/normal_600ef4b955cf3.pdfIn PDF document text
    • http://photoforce.ru/nesukilimex5hss.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388050/normal_5fd70c3839a25.pdfIn PDF document text
    • http://copyrightreports.com/furious_8_racing_gamegwaos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461780/normal_5fcf9281ec0d6.pdfIn PDF document text
    • http://pocki.top/98597466219meld5.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/tifuwuw/procalcitonina_indicaciones.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/danamojeworoliv.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/fluke_5502a_manual_espaol.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_off0000d91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91D 5740 bytes
SHA-256: 8d6315af0e0cef409327fde990206a4fc0189bf02988e1b4f09470a94416827c
font_01_sfnt_off0000ec99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC99 10700 bytes
SHA-256: 992da9d2c7310b50e9c49937e37d5666b9743b49bc8e12d15ec199be597e12f2

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