Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a92421e8d16174…

MALICIOUS

PDF

90.4 KB Created: 2021-03-25 14:48:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6870bdf227d33a6db549026b54ccb29a SHA-1: 5d1d19832502bb3d69be51a78c671f32776642dd SHA-256: 28a92421e8d1617462799b3553cd546f23ab626db6923b31a0a4c5cafef4cabc
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://soxebez.ru/wix?keyword=ottlite+wellness+desk+lamp+manual PDF link annotation
    • http://organicsss.space/ultrasonic_sensor_working_principle5ji4f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374189/normal_5fcdeb5984bde.pdfIn PDF document text
    • https://ridawixesij.weebly.com/uploads/1/3/4/6/134660161/b7dbad575a20.pdfIn PDF document text
    • http://gufutaca1.xyz/supply_chain_management_jobsq3ubj.pdfIn PDF document text
    • https://kiruxujekan.weebly.com/uploads/1/3/2/7/132740547/7043070.pdfIn PDF document text
    • https://fubaxegadajud.weebly.com/uploads/1/3/4/4/134454669/e425d30125a.pdfIn PDF document text
    • https://lusebedadejaxid.weebly.com/uploads/1/3/1/4/131407110/lepotojifulisi.pdfIn PDF document text
    • https://rifakinuzofu.weebly.com/uploads/1/3/0/8/130815009/4092790.pdfIn PDF document text
    • http://naturebiolog.space/90841682110mx23f.pdfIn PDF document text
    • http://zowedikeseku.iblogger.org/zujokiromiduteg.pdfIn PDF document text
    • https://vujirazezada.weebly.com/uploads/1/3/2/6/132681664/xajejugajowa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467322/normal_6032a285c7aa6.pdfIn PDF document text
    • https://kuwuxegizeduki.weebly.com/uploads/1/3/2/6/132695805/puvusiriwul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pifaramurul.rf.gd/how_to_know_what_kind_of_books_to_read.pdfIn PDF document text
    • http://jusiwanemil.epizy.com/77367598260.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/types_of_earthquake_waves.pdfIn PDF document text
    • http://fudojozijenabux.epizy.com/32180173212.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/97818570020.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn 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_off00010d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D22 5192 bytes
SHA-256: c6e435bd640ab3405b87ac90f4501afe8e6a0c7751582b51c3e33dc990cec05a
font_01_sfnt_off00011ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED0 11784 bytes
SHA-256: ecd9b6f66cac6d610c2fb724068136438198dec471cc97eab5ae8c918ac08cc0
font_02_sfnt_off00014752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14752 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2

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