Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a97da8ce75bbd97…

MALICIOUS

PDF

65.7 KB Created: 2021-02-20 03:10:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4bc12eceb7aa914be6eedae82ef4fb9c SHA-1: 9b542632a6eb3a9d218243d7bcf46a0e920f522b SHA-256: 4a97da8ce75bbd976251a17260b3102adefd1961179b26745b16c66bf3bfc564
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to disposable domains and are likely part of a link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan threat. The embedded URLs suggest a redirection mechanism to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • 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://leonvi.ru/strik?utm_term=life+fitness+integrity+series+upright+bike+95ci PDF link annotation
    • https://wipegozi.weebly.com/uploads/1/3/0/9/130969535/worinugel.pdfIn PDF document text
    • https://daputonekamipit.weebly.com/uploads/1/3/0/7/130775603/ca72eb7c666.pdfIn PDF document text
    • https://tusululobiwivet.weebly.com/uploads/1/3/1/1/131163859/supavokesifafox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446776/normal_5ff22d51bad06.pdfIn PDF document text
    • http://fepekasizu.iblogger.org/ashes_of_oahu_pc.pdfIn PDF document text
    • https://nusevusigafub.weebly.com/uploads/1/3/1/3/131398220/raben.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382962/normal_601b6697e336e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374521/normal_60024c86ddcfb.pdfIn PDF document text
    • https://kemumapuvepuvi.weebly.com/uploads/1/3/4/3/134311950/kopotixudezepob.pdfIn PDF document text
    • https://gumabudisipinef.weebly.com/uploads/1/3/2/7/132712006/fazidiraba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480886/normal_5febc25f4d59d.pdfIn PDF document text
    • https://fukefaxetudaze.weebly.com/uploads/1/3/2/3/132303366/bofap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://besipobewawite.rf.gd/mobogenie_mod_apk_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/akuntansi_adalah_sistem_informasi.pdfIn PDF document text
    • http://jilutuve.rf.gd/android_studio_sharedpreferences_save_arraylist.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_off0000c248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC248 5564 bytes
SHA-256: 012a47764ba0cc6fee0ebcd95a9c1ddd4db6e2e521aab9212be1d0fe8e9fde3d
font_01_sfnt_off0000d545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD545 10660 bytes
SHA-256: cfaca193ae421afadec8381c96acae77f9877958841ce61608bb0d079607bc9f

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