Malicious PDF — malware analysis report

Static analysis result for SHA-256 706c4aca93b1fec8…

MALICIOUS

PDF

75.9 KB Created: 2021-01-26 11:59:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 41e893d5330578b8ef44068589bf5843 SHA-1: eb7316c8d262a8c413ddd1da2418002f99104047 SHA-256: 706c4aca93b1fec881b42886651a77ea1fdbd5d75e94726c1c70385565b9b50c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to disposable hosting or are used in a link farm. This behavior is indicative of SEO manipulation or a phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

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://leonvi.ru/aws?utm_term=piano+sheet+music+treble+clef PDF link annotation
    • http://tisigetid.iblogger.org/composite_materials_text_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460057/normal_5fdc35b6ec5ac.pdfIn PDF document text
    • https://gavixidosoxadi.weebly.com/uploads/1/3/0/7/130776067/d95fd88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417997/normal_5fda81ae8e6fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409819/normal_600aa82011f64.pdfIn PDF document text
    • https://moxuzoketo.weebly.com/uploads/1/3/1/1/131164531/339177.pdfIn PDF document text
    • http://xugafigipi.22web.org/dezomapogilaxego.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4504568/normal_6001d788250ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454541/normal_5ff39c01c43ee.pdfIn PDF document text
    • https://vulopinuvi.weebly.com/uploads/1/3/1/1/131164419/depuna.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404124/normal_5fc7701133d8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458615/normal_5fe8587595512.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451374/normal_600aee93e2b09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454681/normal_5fe21c15c5d42.pdfIn PDF document text
    • https://pawomasa.weebly.com/uploads/1/3/4/7/134737305/mipupaja.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://woxebolinos.rf.gd/47407259421.pdfIn PDF document text
    • http://kixomeremit.epizy.com/pigosivuragojo.pdfIn PDF document text
    • http://petizitopebil.epizy.com/danod.pdfIn PDF document text
    • http://nivosifif.rf.gd/61860777267.pdfIn PDF document text
    • http://witegev.epizy.com/4509132097.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE78 5260 bytes
SHA-256: b4014f18194766b8dcb0487d36c6b0c6fa57becf21fe4ea1aa62e197959cfa2d
font_01_sfnt_off00010033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10033 9912 bytes
SHA-256: fa01a3f504c45da8131a89dc3cdba2ca2cef2d7a1aa7d320a9beb2328e257cca

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