Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d8cb5ae2b618f24…

MALICIOUS

PDF

73.5 KB Created: 2021-06-11 06:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ce5f33c455b756e553e0d7f99bd966c0 SHA-1: dd1ac1767895744d63f628ef406b47dfe17ad7e2 SHA-256: 9d8cb5ae2b618f241de3334a27a5826641fe6335fee6c2706b335a471016e019
166 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://crysiq.ru/pbw?utm_term=how+do+i+hard+reboot+my+iphone PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4416802/normal_6005a124294fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404733/normal_600e699067746.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457839/normal_604f1d78a3ac9.pdfIn PDF document text
    • https://xixafaxuxux.weebly.com/uploads/1/3/4/3/134340403/tesum.pdfIn PDF document text
    • https://gevivefopunuxaf.weebly.com/uploads/1/3/4/3/134331765/6833558.pdfIn PDF document text
    • https://rirofogarerena.weebly.com/uploads/1/3/0/7/130775169/pegusafoxesunam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb0ebb2c-d322-465c-a8b8-d9c6c46f0a85/72956881350.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/903c86da-a661-445a-a4e1-d2ea1ad60e8d/sevadafijogubaderilonuj.pdfIn PDF document text
    • http://zobafolu.pbworks.com/w/file/fetch/144990411/gta_san_andreas_highly_compressed_6mb_android.pdfIn PDF document text
    • http://gonumutat.pbworks.com/f/systematic_review_methodology.pdfIn PDF document text
    • http://mamejoniza.pbworks.com/w/file/fetch/144658359/86436920306.pdfIn PDF document text
    • http://magogopowo.pbworks.com/f/metformin_and_dizziness_side_effects_forum.pdfIn PDF document text
    • http://vazesuna.pbworks.com/w/file/fetch/144616434/vebotowufogoper.pdfIn PDF document text
    • http://xosufixemuf.pbworks.com/f/worixurovigavurexuliso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ebb49c1-89a8-46ce-99c7-b15c1a28e05a/97680094908.pdfIn PDF document text
    • http://posonuxe.pbworks.com/f/single_compound_and_complex_sentences.pdfIn PDF document text
    • http://lakobun.pbworks.com/w/file/fetch/144969198/fevulurevuxil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31880a08-cda4-412e-b0da-f0403faa1e05/gevinosemul.pdfIn PDF document text
    • http://viluxese.pbworks.com/w/file/fetch/144694356/8213544986.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da8544ad-e612-460b-afa4-3e6926676c07/89511542429.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_off0000e24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24B 5284 bytes
SHA-256: 6825ca0a694c4891bc148d9f2b760ffd1fed582066869194bc652859f01d9d4b
font_01_sfnt_off0000f424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF424 10268 bytes
SHA-256: 0b91709b97dc98d0ea1b4cb5b2b3692aea8cd70c9f5e7de352d7cd33b2e6cfc7