Malicious PDF — malware analysis report

Static analysis result for SHA-256 82050e49910efbba…

MALICIOUS

PDF

77.1 KB Created: 2021-01-09 18:48:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 676bb38a71a732855c9b595bcfcb5efa SHA-1: 7bcbaa0e843f39d4e1a9dacd4bae7bcfae79841c SHA-256: 82050e49910efbbad9116029304071f0cfad4fb483da1b3d5e3daf36653ba656
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, including a critical finding for a malicious redirector link. The document contains a link farm with numerous external PDF links, many hosted on disposable domains, suggesting a phishing or malware distribution campaign. The embedded URLs point to known malicious infrastructure, likely intended to redirect users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/aws?utm_term=audit+trail+report+l%25C3%25A0+g%25C3%25AC In PDF document text
    • https://cdn-cms.f-static.net/uploads/4418391/normal_5f988103bd3c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448347/normal_5fa22495688ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368238/normal_5f9f2b41d77c6.pdfIn PDF document text
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/c26879.pdfIn PDF document text
    • https://nijubalalo.weebly.com/uploads/1/3/1/4/131453980/9851903.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422640/normal_5fd7e4e2e4a45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404287/normal_5fabc97b3d451.pdfIn PDF document text
    • https://pavufunipuz.weebly.com/uploads/1/3/4/2/134265556/sabivoxosezil-muxisaxukolos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375204/normal_5f9cf188d04ec.pdfIn PDF document text
    • https://baxegirugono.weebly.com/uploads/1/3/5/3/135319521/bivodi_xogutiwekoposig_vivubuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383574/normal_5fb59e3aabc30.pdfIn PDF document text
    • https://cdn.sqhk.co/wevexifimur/gcheYie/alienware_desktop_reviews_2020.pdfIn PDF document text
    • https://nirawulef.weebly.com/uploads/1/3/4/3/134324477/xetan.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/kofabube/hidden_video_recorder_android_app.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/siroso.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AE 5228 bytes
SHA-256: b61652f8f82d000418031bb7a9d345bc41335fcf7333a6c3b7b27913e62eac05
font_01_sfnt_off0000e6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EB 13792 bytes
SHA-256: 45fa1c7efceadf12e307cd446a0a26b558948bb4e6d73e825466f54c00dcd736
font_02_sfnt_off0001108e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108E 16076 bytes
SHA-256: d4a88a3a8205faafa880075823aabd831252e3f8020b7d06daf30e92536d8b86

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