Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc428a6db9d1e7a3…

MALICIOUS

PDF

86.3 KB Created: 2021-03-21 04:47:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: eda52e3c2f962f2344487283c40d5161 SHA-1: be7b9e760434ffab63e29a8288b8825fd515c2e3 SHA-256: cc428a6db9d1e7a3a33e6abb306c14ad5baab77c928d85854eefd6c199a6daba
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lead users astray.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://pelibifir.ru/wix?keyword=papa%2527s+games+unblocked PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4444882/normal_600e67e699af6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366401/normal_60305c2c75d84.pdfIn PDF document text
    • http://katopikinu.22web.org/jupaluzaxidesagi.pdfIn PDF document text
    • https://javabudonoban.weebly.com/uploads/1/3/2/6/132683403/1765626.pdfIn PDF document text
    • https://lobixeximoruse.weebly.com/uploads/1/3/5/3/135319822/mamosiraga-titifij-vikovukawamij.pdfIn PDF document text
    • https://sufudoni.weebly.com/uploads/1/3/4/8/134853368/1973270.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485591/normal_5ffcb236e973f.pdfIn PDF document text
    • https://cdn.sqhk.co/ribafesupuro/cH3IjhG/gafufipoforob.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/ehghiKa/outlaws_american_stock_car_racing_3d_download.pdfIn PDF document text
    • https://gupapuna.weebly.com/uploads/1/3/4/7/134726568/fadawijajexesa.pdfIn PDF document text
    • http://logusubunovad.22web.org/will_amox_clav_875_mg_treat_tooth_infection.pdfIn PDF document text
    • https://cdn.sqhk.co/bikugipozamu/dpQySuM/rabaniwaxa.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/136fd8e4-5317-4a91-a56f-5edadf53af85/how_to_enter_promo_code_on_pokmon_go_iphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31a0d0b5-f7ab-4e89-a4df-599a96c6296a/41365402753.pdfIn PDF document text
    • http://burisaxaz.rf.gd/24366611789.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88ec747b-92e3-4368-a305-e1f5409e9ddb/dipiro_pharmacotherapy_drive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b896189-3f4c-497d-94d7-0ecfdb5cb696/collins_gem_sas_survival_guide_pocket_book.pdfIn PDF document text
    • http://zubidimuxazevow.epizy.com/joindre_plusieurs_ensemble.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/679c0b59-82b6-47e4-a300-4a0d4dcebceb/my_cloud_home_4tb_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01656c17-945c-41a9-9c30-af4562b4b8fa/3_5_8_pulgadas_a_milimetros.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5bba41f-a98e-4230-8802-edcc9f7cdfd1/guresedenilejagobopot.pdfIn PDF document text
    • http://winibivazizi.rf.gd/84224216066.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_off000111f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F1 5536 bytes
SHA-256: d1fcc91948581179a27edab54a2da8a58d78ef9a7a954e72264b72c83a09760a
font_01_sfnt_off000124bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BD 11748 bytes
SHA-256: 47d53f49295477f2870c8f0aa55c08753c6e3ddea0212f115ae2d386168340ce