Malicious PDF — malware analysis report

Static analysis result for SHA-256 310f9d9483a6f2e9…

MALICIOUS

PDF

69.5 KB Created: 2021-02-17 07:40:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b51f9bf14e0b2a53c4c2d21244815b0d SHA-1: 84c22a96c9a1db9784f7dc021f2de18619e2f49c SHA-256: 310f9d9483a6f2e947cec9b6ba72ff29c81dc9bd911798614a4784a0c4e2cfd2
184 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It functions as a link farm, embedding numerous URLs that redirect to potentially malicious infrastructure, as evidenced by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' firings. The primary goal appears to be directing users to external, untrusted sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=states+of+matter+word+search+printable In PDF document text
    • http://rastet-malysh.ru/pressure_conversions_worksheet_13-_1_answersmxre8.pdfIn PDF document text
    • http://avtovishki-msk.ru/towavotekutes571b6.pdfIn PDF document text
    • https://wukakokusaz.weebly.com/uploads/1/3/0/7/130739200/2560033.pdfIn PDF document text
    • http://regse.website/paralel_ve_meridyenler_test9ff4e.pdfIn PDF document text
    • http://freds.space/85855822079nj2ub.pdfIn PDF document text
    • http://teenagetutor.online/6084041937tm51g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413966/normal_5fdcbf58d015e.pdfIn PDF document text
    • http://prodit.space/addressing_mode_of_8086_microprocessorvl8jq.pdfIn PDF document text
    • https://nedalejurozawo.weebly.com/uploads/1/3/0/7/130776692/622302.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492600/normal_601f1ecbafd5b.pdfIn PDF document text
    • http://expressvpn.store/user_instructions_for_kindle_firei59qu.pdfIn PDF document text
    • http://wspring.space/776324341161yj7.pdfIn PDF document text
    • http://italysummer.space/61069756779m02h6.pdfIn PDF document text
    • https://wosumugip.weebly.com/uploads/1/3/4/8/134867897/muluzusami_woviv.pdfIn PDF document text
    • http://istra-backwater.ru/cavernous_malformation_of_the_brainstem0yyh1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484364/normal_6017426893476.pdfIn PDF document text
    • https://vesabigixovo.weebly.com/uploads/1/3/1/8/131857304/2685982.pdfIn PDF document text
    • http://prizyivnik.ru/bikefasad6r2qj.pdfIn PDF document text
    • http://select-get.top/dunevurexivabidcrd22.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/internal_audit_assurance_report_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/general_warranty_deed_oklahoma_statutory_form.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/machine_movie_background_music.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/report_someone_driving_erratically.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_off0000d231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD231 5732 bytes
SHA-256: 82828630daf5b8a4652e6bd448a22490ea476324633f0a1f4c29aac7da5bd4c7
font_01_sfnt_off0000e597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE597 10248 bytes
SHA-256: d05ad0231250a00425f7c8d3bf73f0d90a18026f5c4605e804dfeadcc77310e1

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