Malicious PDF — malware analysis report

Static analysis result for SHA-256 d78994bab8081c56…

MALICIOUS

PDF

74.6 KB Created: 2021-01-30 14:49:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: cd6bcd2f1af6a768dd39ccf69c7240fd SHA-1: b700008a4145515bba9c860ad425d39162339d4c SHA-256: d78994bab8081c56595671cb13a4da5db9374054e5a242122a5b23974ab1c2d2
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a PDF SEO link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest a phishing or malware distribution scheme, likely initiated via spearphishing. No scripts were extracted, but the PDF structure itself facilitates redirection.

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=adjectif+possessif+et+demonstratif+exercice+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4492588/normal_5fd31a9b78429.pdfIn PDF document text
    • https://zimizediregewoj.weebly.com/uploads/1/3/4/0/134040679/c866e845eca.pdfIn PDF document text
    • http://levantemosaic.com/617464550138nqe6.pdfIn PDF document text
    • https://semulojera.weebly.com/uploads/1/3/2/6/132695334/1c3f676145d5f.pdfIn PDF document text
    • http://lnstagram-blue-badge-form.com/69886676313mkkf.pdfIn PDF document text
    • https://sunakolezapomuj.weebly.com/uploads/1/3/4/6/134698053/zegevalivivop.pdfIn PDF document text
    • http://clebohets.xyz/gold_glitter_desktop_background7qfsi.pdfIn PDF document text
    • http://ampinternational.org/41105974445fer2p.pdfIn PDF document text
    • http://money-team.site/896550449473il6x.pdfIn PDF document text
    • http://lasns.fun/mini_putt_open_near_mebi6t5.pdfIn PDF document text
    • http://all-system7.club/92092122253micoj.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/sesijesule/ranixonewos.pdfIn PDF document text
    • https://s3.amazonaws.com/tiniruru/58269358163.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/business_performance_analyst_admiral.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/majarijetapefuxasatem.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/aircraft_maintenance_manual_vs_component_maintenance_manual.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_off0000e1fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FB 5404 bytes
SHA-256: 11e4c4655b228f8d68ee6d0c49d064b89461fad8e4f2ff1dbde9db50625b1942
font_01_sfnt_off0000f451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF451 12320 bytes
SHA-256: 6eda7c1a327a7ec807c8fe84b55c3e0c297317c6f711b0334549dae655acec85

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