Malicious PDF — malware analysis report

Static analysis result for SHA-256 24a0d915c0be7bb8…

MALICIOUS

PDF

123.0 KB Created: 2021-03-20 18:16:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 232e0eb9837e03d9eea32b03502e7a77 SHA-1: 0d630ae60b7df416964a8883cf48701c84a7b590 SHA-256: 24a0d915c0be7bb89cfee65d2b0e41e6e497fa4ee9be786ace03ee504d0fb372
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs further supports this. The document body, though heavily corrupted, appears to be related to search terms, reinforcing the lure of finding specific information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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://midufefew.ru/wix?keyword=chilton+auto+repair+manuals+online PDF link annotation
    • https://cdn.sqhk.co/ligumorik/hLSK12T/zajutiluvapenoxafewefesoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374022/normal_601f248d10d3a.pdfIn PDF document text
    • https://cdn.sqhk.co/tolebilu/ggjc1ie/my_aviva_app_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/wojusipi/Sfifzqz/luguvuxijeroz.pdfIn PDF document text
    • https://zofiludel.weebly.com/uploads/1/3/5/3/135347527/90e909020f3272.pdfIn PDF document text
    • https://cdn.sqhk.co/sozedikepasu/jjaMmRV/46324573987.pdfIn PDF document text
    • https://povefedonigo.weebly.com/uploads/1/3/1/6/131637150/07d632ccf8b2.pdfIn PDF document text
    • https://zepigebilotexo.weebly.com/uploads/1/3/0/7/130739401/ximokiburamovib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446027/normal_5fca294d57c9b.pdfIn PDF document text
    • https://cdn.sqhk.co/safovokon/gZdgdih/ocean_rift_vr_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369901/normal_60226ad65d291.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/ef9dcfb9-9b33-4d47-8194-126efb7dca03/persuasive_essay_topics_for_4th_graders.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29f23237-8911-4448-bf4b-2344f29e0a67/bose_321_gs_series_iii_price_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/764db2fe-f3b1-4344-812c-1da1465bfaf6/what_can_cure_patrick_lencionis_5_dysfunctions_of_a_team.pdfIn PDF document text
    • https://7737876a-f762-42ef-af6f-18b78abacabf.filesusr.com/ugd/9066bd_5a0d308f33e4470193aef2c936283aaa.pdf?index=trueIn PDF document text
    • https://b1d4f555-1eac-4d61-aa83-27206cf3ee4b.filesusr.com/ugd/1706f5_c4c9a04ec0064b019490e8f1824fb930.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d13761f-ed3a-44c7-80da-c62caa166d12/is_rav4_hybrid_reliable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b2d9151-7c41-4c8d-9bd7-7fceb981036e/team_air_fl_studio_12.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_off0001a545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A545 4964 bytes
SHA-256: 163b953baa959ef80c163ea73d24a371bf8544afd5b2f43382f56d7b822767d7
font_01_sfnt_off0001b5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B5F4 12108 bytes
SHA-256: a2b9e45aaff54dce6e41b45a58b75700a109f44a877f6e11f82c4b3d9810ff1c

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