Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f1375f25f122adf…

MALICIOUS

PDF

67.8 KB Created: 2021-03-09 14:33:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c07ab7e4617dfc01d820fcf8f76a6de2 SHA-1: 7b2d77018351b56ec83172ab88276cf3d77cafaa SHA-256: 5f1375f25f122adfc5c9179e729d6e99c9266752ab0a259e2f49ec0e77ee5af2
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, with a critical heuristic identifying a 'PDF_SEO_LINK_FARM' suggesting a large number of generated links for SEO manipulation. The embedded document body, though heavily obfuscated, contains keywords that might be used in phishing lures. The presence of external URIs points towards an attempt to redirect the user to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/wix?keyword=oriental+market+fort+wayne+indiana
    • https://viwoseloza.weebly.com/uploads/1/3/4/8/134861971/9441134.pdf
    • http://bodyita.space/dibunatimonarodekije9ia2q.pdf
    • http://poradoit2.site/how_to_factory_reset_cisco_cp_8841xd41h.pdf
    • https://static.s123-cdn-static.com/uploads/4376359/normal_5fc9af708f79f.pdf
    • https://cdn-cms.f-static.net/uploads/4403533/normal_6011485804914.pdf
    • https://fajuvupo.weebly.com/uploads/1/3/5/3/135310445/kovamezekitebibe.pdf
    • http://golden-charm.ru/coleman_thermoelectric_cooler_model_5232_manualbdb71.pdf
    • https://tiwibuvemugijaj.weebly.com/uploads/1/3/0/7/130776889/rivajafekidasum.pdf
    • https://muverope.weebly.com/uploads/1/3/0/7/130776407/8349947.pdf
    • http://wekeb.space/insinkerator_555ss_installationvmpgz.pdf
    • https://kominalekawer.weebly.com/uploads/1/3/1/6/131636772/8461302.pdf
    • http://fabermanufacture.ru/9348468803nvmbm.pdf
    • https://nutipofuvi.weebly.com/uploads/1/3/5/3/135310868/5588748.pdf
    • https://static.s123-cdn-static.com/uploads/4453754/normal_5fee859015f74.pdf
    • https://xezelugewopisaw.weebly.com/uploads/1/3/5/3/135311865/6789241.pdf
    • https://famutogerene.weebly.com/uploads/1/3/4/6/134688643/1879116.pdf
    • https://cdn-cms.f-static.net/uploads/4464065/normal_601794c68af49.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kodugexibitomo.rf.gd/adding_unlike_fractions_worksheet.pdf
    • http://kefixofelapadi.epizy.com/slow_motion_bharat_song_bestwap.pdf
    • http://pekopun.epizy.com/wrongly_spelt_words.pdf
    • https://s3.amazonaws.com/sikuva/angry_birds_2_mod_apk_google_drive.pdf
    • https://s3.amazonaws.com/dadupawo/90655344631.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce3b.bin
f50de9071ae42c1a6c62042fd24da5a08d277cb81271c49a2142b746022c6d0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3B 5160 bytes
font_01_sfnt_off0000dfcc.bin
fc79c05cd01a738aa0dfdbc13674ce4ff7297bd19228778746d6e02f1eebb5ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCC 9928 bytes

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