Malicious PDF — malware analysis report

Static analysis result for SHA-256 0523862b9d2e689e…

MALICIOUS

PDF

91.5 KB Created: 2021-04-30 15:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c409be9bd760dffdda144ef7631af18b SHA-1: 556fdc711fe2517e750d589199aeae0d631fda25 SHA-256: 0523862b9d2e689ee3c0fdc5bb5c8f099535a420e1e37db3b898be82c2bf5187
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/strik?utm_term=is+tokyo+ghoul+ok+for+12+year+olds PDF link annotation
    • http://poxexududojal.66ghz.com/letter_of_authorization_signatory_format.pdfIn PDF document text
    • https://cdn.sqhk.co/jozojonujaj/eidL4hf/wakajotenarojumevisutoza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366662/normal_601647e250f1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445880/normal_60117dd24e3f7.pdfIn PDF document text
    • http://tejasatobes.medianewsonline.com/44725920032.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwefuxab/jfhgdtr/75354281951.pdfIn PDF document text
    • http://tozepefaj.iblogger.org/bedaxututufasifosusuz.pdfIn PDF document text
    • https://cdn.sqhk.co/dejijadu/c6MgjIB/1245125455.pdfIn PDF document text
    • https://cdn.sqhk.co/livatunozasu/tj7gfig/52373622847.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zezofakarol.myartsonline.com/antenatal_period.pdfIn PDF document text
    • https://16012499-1299-48b0-8cdd-5f23a7749958.filesusr.com/ugd/fafc38_1d045758a97a45e4bb05ec427143b147.pdf?index=trueIn PDF document text
    • https://d6236f05-450e-4b96-9875-1783d83c708b.filesusr.com/ugd/912de2_43e02a5cebdf43fcaa108382c2a67335.pdf?index=trueIn PDF document text
    • https://042e50b4-45d0-4577-915a-c14d43ab21ad.filesusr.com/ugd/18f527_b6f8b27e224a4d4fbf950ec8f645164b.pdf?index=trueIn PDF document text
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_ff8553f0773e48bea19cc1c4a22d1c00.pdf?index=trueIn PDF document text
    • https://d25e5d79-f3dc-43ab-8538-58f2f4730235.filesusr.com/ugd/898300_63ec78c274434884ab0977030ed41f4e.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FC 15048 bytes
SHA-256: 9866c34302e97084439bcf84c800ddb07342236fb080b055ed1d7d2d7dd72118
font_01_sfnt_off00012552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12552 5456 bytes
SHA-256: 377b4ce8acb7cf4ae65cc2b1f9b3cc9c6a95eb5aa17cba2291a5b54585818021
font_02_sfnt_off000137e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E9 11788 bytes
SHA-256: a3a59fbacf15299aed66e466c64753eec07545a7ce130504abe8370b41224ba8

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