Malicious PDF — malware analysis report

Static analysis result for SHA-256 f620175f6ab369a8…

MALICIOUS

PDF

80.3 KB Created: 2021-02-27 19:25:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 11ef3902d2898e8bfe901683700a1c01 SHA-1: d749d59464bf6d5ed999af387d6dd4f0bd5d329f SHA-256: f620175f6ab369a8478f8cd7a83ae4e8f46f725bc7b990a1e00f81fad189530d
176 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to S3 buckets and other benign-looking PDFs, but also includes a link to mezovuduw.ru which is flagged as unknown. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a tactic to appear legitimate or to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://mezovuduw.ru/award?keyword=angle+sum+worksheet+pdf PDF link annotation
    • https://cdn.sqhk.co/tovipovo/1Rdihbg/paretivofelarabejiposow.pdfIn PDF document text
    • https://vavivaso.weebly.com/uploads/1/3/0/8/130873957/99a68.pdfIn PDF document text
    • http://lumobumekola.getenjoyment.net/should_internet_be_capitalized.pdfIn PDF document text
    • https://zosafetudosejo.weebly.com/uploads/1/3/4/6/134670517/wofowatuka.pdfIn PDF document text
    • https://cdn.sqhk.co/sadinuko/hiUeJhb/bulatemovisini.pdfIn PDF document text
    • https://pagugedupe.weebly.com/uploads/1/3/4/2/134266786/divowax_vumimaw_relotobe_sulosalopuzuta.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/geradi/business_proposal_writing_format.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/latest_android_studio_version.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/aeroplane_song_bestwap.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/laboratory_materials_and_their_uses.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/duplicator_plugin_guide.pdfIn PDF document text
    • http://wenares.myartsonline.com/portfolio_outdoor_lighting_transformer_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/rexunidexiwusumavep.pdfIn PDF document text
    • https://s3.amazonaws.com/dofufiri/lufetojadetulasipitotobuw.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/bilaspur_university_admit_card_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/vanatul/akasha_wira_international_tbk_annual_report_2013.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/blockman_multiplayer_for_minecraft_pro_apk.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000eda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA7 6440 bytes
SHA-256: 2ce5a7286efefc5aae27ce1c31b3347e159d00bd30cf97f509a0b7f7d49caffb
font_01_sfnt_off0000fd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9C 5388 bytes
SHA-256: 6dd1c10786eb8fa50077fbed21d26cb0209ad4049271bbe710728b2e7f01429d
font_02_sfnt_off00010fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE1 10492 bytes
SHA-256: 3a2dcb2185274f6f7e9fc4e23c7ff4435d7173b687a036eb936c30907361cf92

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