Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1cd8ebc4f612b24…

MALICIOUS

PDF

68.0 KB Created: 2021-02-08 19:21:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 84f06a8003428b7953348c6f94bb6790 SHA-1: d37ebba2253903522e03cf3834ab738ab823436f SHA-256: a1cd8ebc4f612b24f590b558636dcf2120e72b6f9202b01c718d318d9a4776f1
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a large number of external PDF links. The ML classifier also strongly indicated maliciousness. The embedded links likely serve to redirect users to phishing sites or download further malicious content, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/aws?utm_term=la+chargers+injury+report+today In PDF document text
    • https://cdn.sqhk.co/nixagigad/cmibChd/life_coach_certification_classes_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/kagelemovo/jgGBidQ/cut_rope_rescue_puzzle_3ds.pdfIn PDF document text
    • https://rawuvuxa.weebly.com/uploads/1/3/4/0/134019107/mikavobaligujo.pdfIn PDF document text
    • https://zevebijupaxize.weebly.com/uploads/1/3/4/7/134754497/1498752.pdfIn PDF document text
    • https://cdn.sqhk.co/vaxarogajib/fiingei/hit_the_roof_speed_gang.pdfIn PDF document text
    • https://cdn.sqhk.co/demexadol/diiNja6/jomezejakav.pdfIn PDF document text
    • https://cdn.sqhk.co/tipusuzog/gejhjb4/27832121024.pdfIn PDF document text
    • https://cdn.sqhk.co/gigemuji/ibjchg3/ted_lasso_season_2_plot.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/rogugagatuf/dbt_worksheets_relationships.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/88216496358.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/lemikeladeromume.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/fozani.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/cdc_abnormal_pap_smear_guidelines.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_off0000ca30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA30 5424 bytes
SHA-256: 42126e458db8ee8557e137e56419ccd93ba1d1dd062140a19dfab35377b5de17
font_01_sfnt_off0000dca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA9 11748 bytes
SHA-256: a421c82680fdbce68d32dc4c2f5231e8b4cbd9cd1b2f3b98499ecc63757d2f86

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