Malicious PDF — malware analysis report

Static analysis result for SHA-256 197f7591f33cef35…

MALICIOUS

PDF

70.1 KB Created: 2021-02-18 01:43:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 435d1d4b892e63d0746fd9dd9a8ae3dd SHA-1: 5c2af63c4bb1192e3e391d182a322ad5ef7fa1ad SHA-256: 197f7591f33cef354e00e4d5db7d23e4ea878a09c555cb5d26bc854d4523e44c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing lure. The ML_NYX_PDF_MALICIOUS and ClamAV detections confirm its malicious nature. The primary IOC is the URL https://jottigo.ru/strik?utm_term=the+ice+dragon+george+rr+martin+movie, which is likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/strik?utm_term=the+ice+dragon+george+rr+martin+movie PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454301/normal_5fdb140f3c28e.pdfIn PDF document text
    • https://warevinigipa.weebly.com/uploads/1/3/4/8/134898994/b8338b7aeb40.pdfIn PDF document text
    • https://fotiterik.weebly.com/uploads/1/3/5/3/135328456/bfda5.pdfIn PDF document text
    • https://widosogepe.weebly.com/uploads/1/3/3/9/133986955/7919a4f8b292684.pdfIn PDF document text
    • https://tamaxanafe.weebly.com/uploads/1/3/1/8/131856242/bemaxusuzemaradov.pdfIn PDF document text
    • https://simepatu.weebly.com/uploads/1/3/4/2/134267103/a56dea6e4.pdfIn PDF document text
    • https://cdn.sqhk.co/kigimijexap/bjgjaha/talking_birds_for_adoption.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453335/normal_601c060349c75.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472488/normal_5ff9285984184.pdfIn PDF document text
    • http://indir-kazan.com/wireless-n_wifi_repeater_firmware_v2.51_r2d8vfy.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/poguvelefa/30908870338.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/8397644817.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/ajax_registration_form_validation_in_php_mysql.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/zododafefufibadesaraxexez.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_off0000d462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD462 5152 bytes
SHA-256: de676181353a28b5f6c1a26d2891ad706c3efe08f960f958dd101605f52ab53b
font_01_sfnt_off0000e5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C4 11072 bytes
SHA-256: 81b28c1e2cab5535964d44016c5fd129de88fe38bc57aeb1394c5aabae1db441

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