Malicious PDF — malware analysis report

Static analysis result for SHA-256 8833b4eb9f8f5e94…

MALICIOUS

PDF

88.8 KB Created: 2021-05-03 23:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a21a684593ae6a500f242664bc037276 SHA-1: 48b4ae0c846deda051d9c32751ef9cf7ad7c5dcc SHA-256: 8833b4eb9f8f5e945f3532caa6faad1426b32bf2ff3dca05a6dff778728345ae
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 hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document, potentially used as a lure for spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/strik?utm_term=the+chemistry+of+calm PDF link annotation
    • http://xevojifixifepi.scienceontheweb.net/awaken_the_giant_within_gujarati.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369525/normal_6031832ccf763.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406793/normal_60490f15dc5f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424378/normal_60570aebc5cee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369174/normal_6036df951d777.pdfIn PDF document text
    • https://danifiwap.weebly.com/uploads/1/3/4/5/134585556/tupetoxokesufe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388293/normal_5fce77031905b.pdfIn PDF document text
    • https://muxapikaw.weebly.com/uploads/1/3/5/3/135346573/3264285.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kavuduvolilazod.myartsonline.com/certificate_of_analysis_sample.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aae66f79-9a0c-4421-aef5-6d8c2e8dae83/learn_python_free_code_camp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a50f3b1b-4dca-4117-9608-0e9ff1ca660f/18200276212.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20c9827e-e70d-47f1-88c3-51bcde736f17/41424606306.pdfIn PDF document text
    • http://kapirexazi.onlinewebshop.net/how_to_find_each_interior_angle_of_a_regular_polygon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61e864fd-8acd-4b23-ac7e-ebb89e84e64e/why_we_use_constant_pointer_in_c.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d9e3546-8ba8-4f67-89c3-92716aa6473c/ncaa_division_2_universities_in_texas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eeba303a-9f1a-404d-a693-997fe85cf51d/27307592175.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_off00011e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6B 5172 bytes
SHA-256: 1573b78694e1268851fb36dbf0ece1e962e3e911ae364e3dede146790f2599c5
font_01_sfnt_off00012fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE1 11416 bytes
SHA-256: 4ed383e6c468a91beebb565a1d0c719fa1a7a65a886045ecd6a24a7a3fb7054a

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