Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c9ce5f9e3cff29…

MALICIOUS

PDF

81.5 KB Created: 2021-03-24 07:49:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: eb7158ef9cda99dabdb21c5525fabd53 SHA-1: 736eb5af0a5db42239f6e4394553ee3a2840db58 SHA-256: c4c9ce5f9e3cff291f1130ed408390947f3d16c773811e03fba1c3ce4677958a
156 Risk Score

Malware Insights

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

The PDF contains a heuristic indicating a mass external PDF link farm, with one prominent URL pointing to a suspicious domain. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, contains text related to 'volume in plastic arts' and the wkhtmltopdf application, suggesting a lure to disguise malicious intent. The presence of numerous external links, including one to a potentially malicious domain, indicates an attempt to redirect the user to a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://midufefew.ru/strik?utm_term=definicion+de+volumen+en+artes+plasticas PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369928/normal_6013b8289a5a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383791/normal_6009eae62a4c4.pdfIn PDF document text
    • https://patakobenidirok.weebly.com/uploads/1/3/0/7/130775678/1c97aa209c1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367925/normal_5fd620aa5b79d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388815/normal_6045f945aceb9.pdfIn PDF document text
    • https://xumizobizuzu.weebly.com/uploads/1/3/4/6/134688834/3568814.pdfIn PDF document text
    • https://ratomewupevo.weebly.com/uploads/1/3/4/2/134234569/loxujalepuwurelunoso.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/sevoga/xilagetagokipetanof.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/63510190454.pdfIn PDF document text
    • https://s3.amazonaws.com/legipalofi/physics_cutnell_and_johnson_8th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/advertisement_writing_examples_for_students.pdfIn PDF document text
    • https://s3.amazonaws.com/zagubip/44740982997.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/cds_form_2019_apply_online.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/tuwimegakafaxubosop.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/among_us_pc_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/fifutez.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/what_is_acknowledgement_in_report_writing.pdfIn PDF document text
    • https://s3.amazonaws.com/lopeteb/android_one_xiaomi_update.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/dolatefufa.pdfIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/italian_renaissance_crossword_puzzle_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/rate_of_formation_of_carbonic_acid.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/zipokowufefasaj.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/juvixifofatebofazadex.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/queen_bohemian_rhapsody_piano_solo.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/ziripelaxikeberififala.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_off0000fd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD82 5360 bytes
SHA-256: 322436a9992937af00a6e9d3291b44b20892f822889e778d974797a2c662fdf8
font_01_sfnt_off00010fb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB3 11676 bytes
SHA-256: 0eb53cd3fc00f6a5dfd6a6c500f1d5be853d586038603c735d97fce62fd7d1bb

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