Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6f776f8abbd1c77…

MALICIOUS

PDF

64.8 KB Created: 2021-03-23 10:43:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2244d7a54d3d9f34818a7e3f279770e7 SHA-1: c8a40e5f5e0834467007adad007ad6c64eeeb8ee SHA-256: a6f776f8abbd1c7760eb787a5a5964a38085f8c4088d3783d15e95018266ad3b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • 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 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://dafemum.ru/123?utm_term=signing+on+behalf+of+someone+else+template PDF link annotation
    • http://zujonatuvetivux.iblogger.org/xedix.pdfIn PDF document text
    • http://sefobadivura.iblogger.org/duxonuzazewuvogut.pdfIn PDF document text
    • http://hisgohar.site/riwebizavelusepxuima.pdfIn PDF document text
    • http://wavoxibex.iblogger.org/pelidowibasujarevaropujo.pdfIn PDF document text
    • http://boxberry-24.cc/carefree_rv_awning_fabric_replacement_instructionsfml9n.pdfIn PDF document text
    • http://lami-lashes.site/64479971697ibzx1.pdfIn PDF document text
    • http://tdsevsvet.ru/buzadedanavogaval9wxy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/22c2b92f-4f06-4e70-97bc-5fdf3c4f56f5/51419418897.pdfIn PDF document text
    • http://nivobilov.epizy.com/18032007707.pdfIn PDF document text
    • https://s3.amazonaws.com/murudute/bimetikilogos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45d6bd77-b1c1-4cbe-9d06-4858d637cbe9/88258887528.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1043283e-00a1-41a1-9a6d-7b241a6eb4ec/intermediate_microeconomics_by_hal_varian_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/it_has_been_reported_that_synonym.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bb7af07-b83b-461e-956a-3246c2c76af4/songs_of_praise_christmas_carols_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/416abdc7-943e-4e97-9d4c-f665ef0b091d/ruvitekokazojo.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_off0000c0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A3 5460 bytes
SHA-256: 46fd27f7af7ea81d70a1eb0cf3418e0bb86a167bd186a3e14307d2c1a3a0c544
font_01_sfnt_off0000d310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD310 10284 bytes
SHA-256: 5f946e2d96b730aa7c0b4c022065990a403ba4c7f2f61a6c8f695bbad4646f3f

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