Malicious PDF — malware analysis report

Static analysis result for SHA-256 4945b0701f3da4e0…

MALICIOUS

PDF

82.6 KB Created: 2021-04-07 05:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c3e0c64ccef17747d13d2c69a3ce1a92 SHA-1: d2f794ea2b2274d3047e02ec1b0471ba4eba9fc4 SHA-256: 4945b0701f3da4e0d29c0d6d1b4d39ec70098e51652cc2c6bca6d9cfa6875f54
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the 'application for loan' lure in the document body further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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://leonvi.ru/award?keyword=application+for+loan+pdf PDF link annotation
    • http://tulomodev.getenjoyment.net/bhu_b._ed_entrance_exam_syllabus_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369308/normal_602a296889672.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468261/normal_6067767ed8e10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417123/normal_5ffb4f5cbd9ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408343/normal_60024800cb7bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462362/normal_6056bde19977b.pdfIn PDF document text
    • http://xatovapotogu.mywebcommunity.org/evermotion_archinteriors_vol_43.pdfIn PDF document text
    • https://bitabado.weebly.com/uploads/1/3/1/4/131436956/a5f51.pdfIn PDF document text
    • https://tezefidusipenu.weebly.com/uploads/1/3/1/8/131857758/6933017.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479223/normal_606218ebcd7ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476768/normal_601720052d96f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471514/normal_603e997840859.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443602/normal_5fdcff6445314.pdfIn PDF document text
    • http://sijiwepi.mypressonline.com/miveseb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454973/normal_6044761209a6c.pdfIn PDF document text
    • http://widaxaruko.mypressonline.com/ayub_khan_book_in_urdu.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://71a5d838-4e22-4830-8da1-7955ec3365f5.filesusr.com/ugd/f2f43e_1664c39dc50b4823866d19eababd5af5.pdf?index=trueIn PDF document text
    • https://03df18d0-0a94-4077-8b44-1f3cf8b7c870.filesusr.com/ugd/23a6c3_f92a999d3d924c249d52adc5c852f3cb.pdf?index=trueIn PDF document text
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_c170d56d85ec45b2b796ddc4b716cd9f.pdf?index=trueIn PDF document text
    • https://7e079b21-6cfc-4bbc-a8af-001f4930a7f2.filesusr.com/ugd/f66805_7d1c098d68b9442b8487cb80848bea7b.pdf?index=trueIn PDF document text
    • https://88749095-6fd7-453f-8e8a-15b48fe47dd1.filesusr.com/ugd/e4d7df_0340beec408040aea6b5760d401bef8f.pdf?index=trueIn PDF document text
    • https://535a9070-e28a-464b-adc5-c02ad08be00b.filesusr.com/ugd/9df9d6_5e0a6289def54147b3179ca1ffbbf11f.pdf?index=trueIn PDF document text
    • https://38e81cab-313f-462b-917d-d566bf782aa4.filesusr.com/ugd/36aba1_15dcc7df06184af8b34ec5e9e0642506.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_off0000fa01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA01 4632 bytes
SHA-256: e72efc1b0389b3c0d1067234cebd692cf4aaa72c89d8dd68658dbf194fc7796d
font_01_sfnt_off000109b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B3 10856 bytes
SHA-256: 3fc704c7d579c928195344257d19714f687d8765a47eaddfdaadefe1677b1c0f
font_02_sfnt_off00012eb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB0 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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