Malicious PDF — malware analysis report

Static analysis result for SHA-256 e15071bfa9c5e0ff…

MALICIOUS

PDF

83.0 KB Created: 2021-03-21 21:00:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f9ca911b2f437067431564fc98418d4b SHA-1: b20cc91ac07557633bfc5481e76d4eef079f9b9f SHA-256: e15071bfa9c5e0ff7e8380c8d5014f91be579bdbeb0d6c2aaadb875ee6cd39db
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wix?keyword=rv12+for+sale PDF link annotation
    • https://mebusogaduvorit.weebly.com/uploads/1/3/0/9/130969439/8614195.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444366/normal_5fe383ef54c27.pdfIn PDF document text
    • http://geleostone.online/12078034757b6ka4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500446/normal_5fee2b6982e8f.pdfIn PDF document text
    • https://malolikekex.weebly.com/uploads/1/3/4/7/134718462/gowujuxazoloke.pdfIn PDF document text
    • https://soridafufunet.weebly.com/uploads/1/3/5/3/135308698/ladoto-bomekanawoput.pdfIn PDF document text
    • http://store50off.info/yaar_nuri_ztrk_kitaplar_epubqg0po.pdfIn PDF document text
    • http://fitokaps.xyz/how_to_fix_xbox_360_update_failedy1246.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://562a32fb-e9c8-4d8f-ac7e-a760da58c396.filesusr.com/ugd/68ec97_bcd5c30eda0b45b8b67c774d19d7a1f2.pdf?index=trueIn PDF document text
    • https://937a8a2d-b41a-4163-aff8-eda6db263557.filesusr.com/ugd/21e6f2_562962db279b4e8eb419edc1b79fef43.pdf?index=trueIn PDF document text
    • https://e25b5f36-ee09-4010-8803-019b2853a23b.filesusr.com/ugd/c34eac_65580873913e46eb9ea58c21765e8892.pdf?index=trueIn PDF document text
    • https://c31d65df-273c-4bcc-acfb-7b03b0724b99.filesusr.com/ugd/e7e4a0_cb7e55e5765d4ebfa50eedf7513502b9.pdf?index=trueIn PDF document text
    • https://a0f88182-e1f9-4a9c-ba22-d5ce004c6985.filesusr.com/ugd/2f3216_3fe6166fda3f45b5a643544286182b9a.pdf?index=trueIn PDF document text
    • https://5a060084-92f5-4e09-b02e-bbac8bb45871.filesusr.com/ugd/05c943_e23867eb41d44af8b7cdcf77f24b4b2a.pdf?index=trueIn PDF document text
    • https://7a512b58-7189-4bc4-8343-f643fa9054c9.filesusr.com/ugd/1e52da_0c288bb2fd8047f4aaf09ec64374fe58.pdf?index=trueIn PDF document text
    • https://0c2a99dd-71fd-4a0d-b96f-672cfa785c21.filesusr.com/ugd/515c54_2ff37de2b02f4c5c9ff63ac690bcc763.pdf?index=trueIn PDF document text
    • https://cf268418-7549-4780-9cff-e39e61b5276c.filesusr.com/ugd/0b1cf2_aa1f8cc2cd774f2982eafdf62820543b.pdf?index=trueIn PDF document text
    • https://00c0516a-c822-4344-a779-6f74e039753d.filesusr.com/ugd/9e41f0_f2ae09b69faf413eb408d588de6ba321.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BE 5012 bytes
SHA-256: d81882e03e16e6b78b5d35c6fd2113a4a3a23d462483efcc4c396fc0d25414cc
font_01_sfnt_off000101ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EF 12360 bytes
SHA-256: acfc8bb55a367ab132f3e378875f564bfddc1dd80338cb5f65878c7c3c41a0e9
font_02_sfnt_off00012a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0C 16060 bytes
SHA-256: 90d911c244295e3c7e37d032667e941bf48a8a1a7a8fd3b3bcf8a758b7c1483f