Malicious PDF — malware analysis report

Static analysis result for SHA-256 89fe892b413beba8…

MALICIOUS

PDF

68.8 KB Created: 2021-03-05 21:54:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: b35e91b8a1d38306f0b8ffc8ee8f0393 SHA-1: 5364b4cad5d1f8a34c6abfcda21ce9856c0ac396 SHA-256: 89fe892b413beba8d879a3b9e642261d87b1637c8dbd5c3e87745e0fdd7aceaf
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URLs point to various PDF files, likely intended to redirect users to malicious content or phishing sites. No scripts were extracted from this sample, but the overall structure and URL distribution strongly indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/wix?keyword=8th+grade+science+eog+answer+key PDF link annotation
    • https://nagaxubonafebax.weebly.com/uploads/1/3/1/6/131606673/1062678.pdfIn PDF document text
    • https://cdn.sqhk.co/xavexapoxiv/dhajhcI/gerudenubadam.pdfIn PDF document text
    • https://cdn.sqhk.co/mubogasaven/jaHC9wr/69667184855.pdfIn PDF document text
    • https://cdn.sqhk.co/dagosasojo/iAtgdDj/ragdoll_throw_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/webuzifinuno/mhhjiyF/game_chat_app_download_kannada.pdfIn PDF document text
    • https://cdn.sqhk.co/jenotonolo/UVTjagj/25062142573.pdfIn PDF document text
    • https://cdn.sqhk.co/lepitajirel/chg4ggU/cruise_line_jobs.pdfIn PDF document text
    • https://cdn.sqhk.co/sajixobuko/sghXjc1/myumobile_mod_apk.pdfIn PDF document text
    • https://donefuvo.weebly.com/uploads/1/3/1/1/131164418/1433644.pdfIn PDF document text
    • https://wovasemuzusalej.weebly.com/uploads/1/3/1/6/131636629/5c9eabb69ba45.pdfIn PDF document text
    • https://wirosumarot.weebly.com/uploads/1/3/1/3/131398493/gagupapipo.pdfIn PDF document text
    • https://cdn.sqhk.co/gafisasiwu/Z3PUgj8/rumejudekidejosed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7a512b58-7189-4bc4-8343-f643fa9054c9.filesusr.com/ugd/1e52da_ede0b191359542189022827535f9ffbd.pdf?index=trueIn PDF document text
    • https://e1eccfe9-8888-4f52-a155-e9c8e84e0752.filesusr.com/ugd/4fb05f_8cf26c6ca09a4244a6d09e31ea6eef61.pdf?index=trueIn PDF document text
    • https://cdfb6f36-dde2-4af5-b3b7-55ff39976061.filesusr.com/ugd/c6ac46_c9aee63d3d8343e296b1355cf59daaa9.pdf?index=trueIn PDF document text
    • https://09235f31-469a-4613-94fc-36d04c1f642a.filesusr.com/ugd/8b6407_d1566402fbf94cf69e1669ab88147fa7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/men_s_fashion_color_matching_guide.pdfIn PDF document text
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_bfa900c90bd34561a80afa038b2d505d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ximupuv/django_url_template_tag_parameters.pdfIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/milova.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/97084057579.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_off0000d005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD005 5528 bytes
SHA-256: 71901749cef1816ca1f50de3adf773e31a37c129d4e4f19f2048e80564781961
font_01_sfnt_off0000e2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E6 10252 bytes
SHA-256: 846b720ed6ea1ef3a31bb9047bad0d6eb3753f12c60240c7e5285813b804bc6f