Malicious PDF — malware analysis report

Static analysis result for SHA-256 5268a11525bafdc8…

MALICIOUS

PDF

85.5 KB Created: 2021-03-16 08:23:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 828074483263522a4c965b1be71acb97 SHA-1: 2226cf549ba0eec6f5668fbb4db6c869479b383d SHA-256: 5268a11525bafdc8f4a96834a8bd3caaed47cfc313462c0525a2015f8320c065
186 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, with ClamAV detecting it as a phishing trojan. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/123?utm_term=amazing+english+1+student%2527+s+book+pdf PDF link annotation
    • https://cdn.sqhk.co/nuvexajamu/jPichjT/46682092499.pdfIn PDF document text
    • http://xafesalizupapal.22web.org/40424357331.pdfIn PDF document text
    • http://lowazutax.22web.org/hindi_alphabet_video_download.pdfIn PDF document text
    • https://cdn.sqhk.co/buzovegom/jaCYie7/pilot_rollerball_pen_amazon.pdfIn PDF document text
    • https://zugimawaxudal.weebly.com/uploads/1/3/1/4/131410952/pukavamowezusiju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501374/normal_6030316b7d966.pdfIn PDF document text
    • https://cdn.sqhk.co/belumozobu/zhd3fhe/condado_puerto_rico_condos_for_sale.pdfIn PDF document text
    • https://sanepawoja.weebly.com/uploads/1/3/4/5/134579143/xejavunojofi.pdfIn PDF document text
    • https://gefozusep.weebly.com/uploads/1/3/5/3/135346228/ludatizukel_zodap_zelarososuz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472766/normal_5feca07d8b63e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381289/normal_60500d337c0b7.pdfIn PDF document text
    • https://gawakugoful.weebly.com/uploads/1/3/4/7/134757428/5fce8ca6bf.pdfIn PDF document text
    • https://cdn.sqhk.co/zimuteraf/Wha0EUJ/the_banner_saga_3_review_ign.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://0bef8565-087b-457a-960c-b0529baba50c.filesusr.com/ugd/638000_957d21d0d2a042a9a2e1c923729638d3.pdf?index=trueIn PDF document text
    • http://bijamujijupife.epizy.com/days_of_the_week_coloring_worksheets.pdfIn PDF document text
    • https://ed0f7819-48b4-4c0d-9119-93de03d81b9c.filesusr.com/ugd/e481ce_32a15a75c2d04231b881ca8346b8c815.pdf?index=trueIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_d224420205cc468c98553ce4abf9f443.pdf?index=trueIn PDF document text
    • https://c6de0af5-2a4c-46da-924c-839bccb102c6.filesusr.com/ugd/5f1f0f_2f44351b4e364071bd9f55c254f86a3d.pdf?index=trueIn PDF document text
    • https://32e47638-7206-44c1-ad53-5c6f9176402e.filesusr.com/ugd/e00742_088ac58ec43f472cb03a842267e95260.pdf?index=trueIn PDF document text
    • https://931f52e6-cb68-4a93-8e02-54808d33f8b6.filesusr.com/ugd/6290de_70a411538d2640b986d7efb2c0ca54eb.pdf?index=trueIn PDF document text
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_9439bfba42454084af0ed506a051bc60.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001014c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014C 5568 bytes
SHA-256: ecf539d32a46af959d538485528064d61cc457670bfdebf305b665e0478e6e1d
font_01_sfnt_off00011417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11417 10592 bytes
SHA-256: 0e74c9712301c48fdbcc602c3b84231e89e3de5fdeabd81d5ecd879886b0a0d4
font_02_sfnt_off0001385e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1385E 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176