Malicious PDF — malware analysis report

Static analysis result for SHA-256 b106f2780da68922…

MALICIOUS

PDF

88.6 KB Created: 2021-06-01 19:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ce8b15ec3558e065f78a3eec602e8c26 SHA-1: 77dde1c47cb490c4cc7a33bd31040297bc3ebb40 SHA-256: b106f2780da68922698c4bf6c26096c96e3b4bb8094d367cc1bc3247a5686b22
246 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm or phishing attempt. The heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document may be attempting to trick users into revealing sensitive information. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://catamma.ru/pbw?utm_term=java+mcqs+with+answers+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4423166/normal_603e28fb7e01c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366659/normal_6020a92adf719.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368479/normal_6023e0420fb8c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451208/normal_5fff3bbfe9f79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450248/normal_60622d19a7e8d.pdfIn PDF document text
    • https://rodironamo.weebly.com/uploads/1/3/5/3/135347674/8955982.pdfIn PDF document text
    • https://wubomedigupuda.weebly.com/uploads/1/3/4/6/134696881/pujipebidupaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488102/normal_600f27d37140e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501042/normal_6064ea9336e27.pdfIn PDF document text
    • https://wimugedi.weebly.com/uploads/1/3/4/7/134725841/lanamuzivixulinip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460055/normal_5fe3e81519c9f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427086/normal_5fe559962ac5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454562/normal_6013ae8ad1456.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498330/normal_600673c503d0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367287/normal_600b4d212d49c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404108/normal_5fd60b7695948.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474759/normal_60288e651f745.pdfIn PDF document text
    • https://pamibatofenowa.weebly.com/uploads/1/3/4/5/134525539/fogebovowiwidiv.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
    • http://foziwedugumu.pbworks.com/w/file/fetch/144466287/pugikutexuzaruw.pdfIn PDF document text
    • http://finebov.pbworks.com/f/bopuvetisabutetilavoj.pdfIn PDF document text
    • http://kevuxezedila.pbworks.com/f/vomupa.pdfIn PDF document text
    • http://barumena.pbworks.com/f/41004802695.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00012844.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12844 18800 bytes
SHA-256: e18cef51ea4fab151ed19359e198c283bacb8b65c3d61c13f2a272dc00dabcb8
font_00_sfnt_off0000eee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE6 5308 bytes
SHA-256: 9a1c110f5829f48545b98ae23607ebb21b3e0ab21cd3323abcdc13e21659fe4e
font_01_sfnt_off000100d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D3 11604 bytes
SHA-256: d559ccacaf493a441f865da3e809be903c941242e9cffeaed70fa7eff0a3a528
font_03_sfnt_off000145ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145EE 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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