Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eb1dd8c955ae649…

MALICIOUS

PDF

77.4 KB Created: 2021-03-22 00:23:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ff67fedd0de1df8cbe721a40f44896cf SHA-1: baf2d386cbd49c4ca967497542e63bdfbdd292b8 SHA-256: 7eb1dd8c955ae649cf54d11ebe4f69b9b1766668ce333a6f1ee73e05571c3efa
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely related to spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://mezovuduw.ru/award?keyword=enuresis+nocturna+pdf PDF link annotation
    • http://arthromedro.xyz/cry_beloved_country_movieqvc33.pdfIn PDF document text
    • http://agent-ritual495.online/kekewevoperomenygcu.pdfIn PDF document text
    • http://iuts.space/class_9th_biology_notes_kpki0nx2.pdfIn PDF document text
    • https://cdn.sqhk.co/nixafusoda/jeLhgja/18286521151.pdfIn PDF document text
    • http://natur-bio.space/backbeat_fit_3100_spare_charging_case0bkqp.pdfIn PDF document text
    • http://jadebey-x.com/thank_you_mandarin_translationnj68w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473618/normal_603ef963ddd66.pdfIn PDF document text
    • https://cdn.sqhk.co/digipexula/edsgihg/flagstaff_az_rock_climbing_gym.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423431/normal_601673413f186.pdfIn PDF document text
    • http://lnstagram-verifedbadge.com/824762270397xdx3.pdfIn PDF document text
    • https://cdn.sqhk.co/xonipavu/5ibgiku/3226763827.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445729/normal_60468d0304305.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479435/normal_5fe4a4d40fc51.pdfIn PDF document text
    • https://cdn.sqhk.co/xulawajikigi/miggg7V/14319053981.pdfIn PDF document text
    • http://item-mask.top/how_to_workout_chest_with_resistance_bandst6kd7.pdfIn PDF document text
    • http://coloradocustomelectric.com/states_and_capitals_game_sheppard_software568fy.pdfIn PDF document text
    • http://game-pro.xyz/61636791018acrt5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_ac594ff01be644098272351e208303f6.pdf?index=trueIn PDF document text
    • https://86146b48-cf95-488a-b5a0-22832f4589a6.filesusr.com/ugd/3b4eee_252b4413b95b4d97897edf458cbd97fc.pdf?index=trueIn PDF document text
    • https://b64dd490-e5b9-492f-89ff-e398ecee904c.filesusr.com/ugd/5926b4_db7f2f1d0c4245f5bf5bf6393cb2934b.pdf?index=trueIn PDF document text
    • https://c208ddc4-37ec-4cef-823d-79aeaa8cd68a.filesusr.com/ugd/d34c4d_c6f4576ef4ea446792b0f5c9841a1565.pdf?index=trueIn PDF document text
    • https://cf587a47-7c2f-4f55-8bbb-21a4c73503f7.filesusr.com/ugd/8ea597_377fc8c782ae4c86880b77bd7643ff4b.pdf?index=trueIn PDF document text
    • https://0d555108-1732-4721-8d72-76d747b2053a.filesusr.com/ugd/1b0481_50c67e0efa0d4ed582db87fdd6cf1dc8.pdf?index=trueIn PDF document text
    • https://76c9fb28-c10e-4950-85be-37de24a2ede8.filesusr.com/ugd/fa32a6_87f3d2d93985423c91ab54e481e9542b.pdf?index=trueIn PDF document text
    • https://cc968bdf-8a18-4a65-a72d-893c706ef441.filesusr.com/ugd/bae363_4d8dd966dd9b4d5b8bb32643933a85f1.pdf?index=trueIn 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_off0000f367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF367 5072 bytes
SHA-256: 261589dfb1e461800b0dfd2911df1192a0404e5d11235bf568562fab67c839df
font_01_sfnt_off000104be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BE 10416 bytes
SHA-256: 39691a991929d8520432f21af77f6b5378a3cb087dbcb5ffdf87aff0af9a7fce