Malicious PDF — malware analysis report

Static analysis result for SHA-256 15a605172b6d83b5…

MALICIOUS

PDF

77.4 KB Created: 2021-03-13 19:36:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d433127f5c6b634d14fa7ae3e89665ea SHA-1: f1d49db4d2eae6335537b3086d62dabd3c257db4 SHA-256: 15a605172b6d83b554e77e03073eeeec842244f18a15e7f0491bb10dfc3955c6
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' indicating a large number of outbound links. The primary malicious URL, 'https://nipisod.ru/award?keyword=cetoacidosis+diabetica+diagnostico+y+tratamiento+pdf', suggests a lure related to medical information to drive traffic to a potentially malicious site. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/award?keyword=cetoacidosis+diabetica+diagnostico+y+tratamiento+pdf PDF link annotation
    • https://lenololiwi.weebly.com/uploads/1/3/4/4/134455370/d3fbf13e.pdfIn PDF document text
    • https://cdn.sqhk.co/kosojilufut/jcfC6w2/82759198111.pdfIn PDF document text
    • http://lenuvivureropi.scienceontheweb.net/plc_programming_jobs_in_sri_lanka.pdfIn PDF document text
    • https://cdn.sqhk.co/vewimidipiv/jVbD3Ap/knights_table_stainforth_facebook.pdfIn PDF document text
    • https://cdn.sqhk.co/vanewano/ecpEjg3/13668048997.pdfIn PDF document text
    • https://wobomiti.weebly.com/uploads/1/3/4/5/134501920/521972.pdfIn PDF document text
    • https://ramasiwo.weebly.com/uploads/1/3/5/3/135390431/775739.pdfIn PDF document text
    • https://leluwimatuw.weebly.com/uploads/1/3/0/9/130969986/zarutavidof.pdfIn PDF document text
    • https://fuwamelewupo.weebly.com/uploads/1/3/4/1/134131589/7724412.pdfIn PDF document text
    • http://wisatemubudu.medianewsonline.com/33156158944.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/dejazuvorira/california_king_size_bed_sheets_india.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/91128842302.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/definite_integrals_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/27671083734.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/cataract_surgery_guidelines_2017.pdfIn PDF document text
    • http://ruzizasasasami.rf.gd/definition_dryer_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/camera_scanner_app_android.pdfIn PDF document text
    • http://fonimegalidoxu.epizy.com/xobagax.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/mineral_identification_answer_key_gizmo.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/dukewa.pdfIn PDF document text
    • http://wejufutaz.onlinewebshop.net/lotesedisifomoso.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_off0000dd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD61 5496 bytes
SHA-256: 4c91e5d9a0644915a051926f22a21541bfa49e307d1093d3b28a10bbec668470
font_01_sfnt_off0000eff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF5 12108 bytes
SHA-256: e83e1117fecacc5a1553c71a71909a6dabfa07f4776e8ba3c4d1de44ca759a5a
font_02_sfnt_off00011777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11777 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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