Malicious PDF — malware analysis report

Static analysis result for SHA-256 7345f6d0dcd5af0a…

MALICIOUS

PDF

73.0 KB Created: 2021-02-18 14:27:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 6a2502c2138fcd02b0ff62ca4c2b2b52 SHA-1: 35402ab6abf411817207d71195784b09bbf95da2 SHA-256: 7345f6d0dcd5af0aa002685bafe1b090e32d28343ad8ecad431746aa55b0c64c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically indicating a phishing or trojan distribution attempt. The presence of a large number of external links, including a link farm, suggests an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm heuristic strongly indicate a malicious intent to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/aws?utm_term=how+to+pump+presta+valve+without+adapter PDF link annotation
    • http://muziwavesos.iblogger.org/calcium_metabolism_in_dentistry.pdfIn PDF document text
    • https://cdn.sqhk.co/sukurorezib/Pgc26MW/video_promoter_app_download.pdfIn PDF document text
    • https://tewamuwomipatus.weebly.com/uploads/1/3/0/9/130969874/d7ce21648a.pdfIn PDF document text
    • https://cdn.sqhk.co/xabiximakef/0hjmLie/mumojoj.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/2jhIjeb/duck_shoot_the_crown_soundtrack.pdfIn PDF document text
    • https://matomuzunoto.weebly.com/uploads/1/3/5/3/135389802/dujekofatamekudaja.pdfIn PDF document text
    • https://cdn.sqhk.co/sowodopevew/fzOieSF/radio_21_live_romania_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tawegoju.rf.gd/mogaxupesiruwalunun.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/89831114835.pdfIn PDF document text
    • https://s3.amazonaws.com/batiku/dsst_lifespan_developmental_psychology_study_guides.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/85616625110.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/lokubufonaw.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/forest_grove_high_school_curriculum_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/30216630882.pdfIn PDF document text
    • https://s3.amazonaws.com/rivazixexuguri/3016874332.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/renowumepojajukaros.pdfIn PDF document text
    • https://s3.amazonaws.com/gapuruxumeg/mainsheet_block_shackle.pdfIn PDF document text
    • http://xagazusapikim.epizy.com/pawipagibusofivime.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxexi/kuminosumufupu.pdfIn PDF document text
    • http://nutogexutal.rf.gd/xivibivorowakerozobanaku.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/city_of_el_paso_water_quality_report.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_off0000e093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE093 5312 bytes
SHA-256: 7b22ab7322fefe8b2069e4a472ced737ecaa3e0a586baec86943cdb56e3f0633
font_01_sfnt_off0000f287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF287 10608 bytes
SHA-256: 093d3fde9efdb9b9c505b89c535532e5b96eb080597ca4d2a6607dcc10dab11b

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