Malicious PDF — malware analysis report

Static analysis result for SHA-256 0557c38411b7e655…

MALICIOUS

PDF

79.2 KB Created: 2021-04-29 00:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 22b971b225c5a1d973273036cda6492b SHA-1: dc086137fb920d094c1695be5ea061eddf583e0e SHA-256: 0557c38411b7e655fc90032e3748993ec719e5947d38060190ecc0c53f04c5a2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection scheme to facilitate malicious downloads. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a game download, aligning with a lure for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/strik?utm_term=black+hawk+down+game+download PDF link annotation
    • http://acgmgroup.ru/how_much_does_a_data_analyst_make_in_canada9x2np.pdfIn PDF document text
    • http://microbladingcertificationdfw.org/bhartiya_samvidhan_in_marathi_book_free6n8rb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456389/normal_5fcc2522009cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483365/normal_601392d8717e6.pdfIn PDF document text
    • http://good-production20.site/xifujuzusiwilomozifex6qil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367951/normal_5ff6640154513.pdfIn PDF document text
    • http://drive4mclanemilwaukee.com/pojupixodekitoylaei.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393361/normal_602f42efed983.pdfIn PDF document text
    • http://trokot-new.online/archaeology_anthropology_and_interstellar_communicationqqasl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386594/normal_5fc7582027af0.pdfIn PDF document text
    • http://shoppingyxplus.xyz/whirlpool_cabrio_washer_door_lock_bypasstokzh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453334/normal_600d019407a8d.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/788a5887-12c4-4a76-89a8-e8d61f6e27b7/magnus_chase_the_sword_of_summer_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/70076878073.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/49061202179.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/extent_report_3._1_maven_dependency.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7abcb47-89dd-46f4-9c0e-99b213813f05/konigugebejutemit.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

Related samples 7

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A9 5284 bytes
SHA-256: 24aa4dfb73f82b2a7a6407bad197e0ecb83e6884817d71c5e64a83b1e3ee5e42
font_01_sfnt_off00010b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B95 10416 bytes
SHA-256: 7ef1cf7e490ef04e5aac240e0ac9ea968f73befc37c9a60cb827e08a548dc502

Open this report in the interactive analyzer, or submit your own file for analysis.