Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0d94475289deeeb…

MALICIOUS

PDF

75.4 KB Created: 2021-01-26 22:35:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: edbf5710b78e1c8f4cc8f0752be19f56 SHA-1: 287f86ac61b80ee663f4cde417cc9423d689924f SHA-256: c0d94475289deeebe574e2fa89b6e36471b9085bc382667064a4994420124841
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the presence of external URIs and the overall structure suggest an attempt to redirect users to potentially harmful content.

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://maypoin.ru/123?utm_term=jefferson+county+montana+solid+waste PDF link annotation
    • https://ruzuxopamekegi.weebly.com/uploads/1/3/4/7/134748505/gifabeviton_bukeselakaf.pdfIn PDF document text
    • http://ru-payment.casa/2257742792lk21e.pdfIn PDF document text
    • http://leduxebawini.22web.org/nanoxebijesiruwamifiwo.pdfIn PDF document text
    • https://cdn.sqhk.co/kixagixupo/4jaichb/my_movie_my_superhero_movie.pdfIn PDF document text
    • http://ruroraratotu.66ghz.com/wrong_turn_5_full_movie_480p.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
    • https://s3.amazonaws.com/bejikefowu/yeshwantpur_platform_number_in_majestic.pdfIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/thalassemia_transfusion_guidelines.pdfIn PDF document text
    • http://jufosuliz.epizy.com/suzeg.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/rijoza.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/metformin_xr_dosage_for_weight_loss.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/guidelines_for_diastolic_heart_failure.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/bombastic_brothers_game.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_off0000dd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD66 5232 bytes
SHA-256: 71f7d70892d4f72243034c59e9746dd5f10357f6000645f190fd38c77d25ca56
font_01_sfnt_off0000ef29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF29 10504 bytes
SHA-256: 839431d8f678b0fd68db9c09536e55f8c6f0ebedb054181ffb5d2bd12fc1166a
font_02_sfnt_off00011301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11301 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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