Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f7ce545b600c812…

MALICIOUS

PDF

81.1 KB Created: 2021-03-19 23:02:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 5a52ff5aea07e0df78323ac024be0e36 SHA-1: 9ac477c887702f61260af1408446f09edc996285 SHA-256: 0f7ce545b600c812e18ed4fb03fbbc497347c31e0f486bf7674da7a5505d74f4
186 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be a lure, possibly related to a schedule, to encourage clicks on these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xajibur.ru/award?keyword=cubs+2020+schedule+pdf PDF link annotation
    • https://pedulexonevexo.weebly.com/uploads/1/3/0/7/130740508/tulufibo.pdfIn PDF document text
    • https://pedumodab.weebly.com/uploads/1/3/1/6/131637036/xibexu_rojog_dojalalosireba_julogorugedapen.pdfIn PDF document text
    • https://kagilomit.weebly.com/uploads/1/3/4/6/134669997/46a16cd.pdfIn PDF document text
    • https://ninobajoxakatud.weebly.com/uploads/1/3/4/7/134702009/f9d817f.pdfIn PDF document text
    • https://tavabaxo.weebly.com/uploads/1/3/1/0/131071290/furekarutiwe_fadokuxusosem_jisazorukoz_mexuje.pdfIn PDF document text
    • https://moduruwili.weebly.com/uploads/1/3/2/7/132710657/kozamutixexamaduw.pdfIn PDF document text
    • http://dipolomisegon.iblogger.org/what_are_the_types_of_ethical_hackers.pdfIn PDF document text
    • https://luxexawasoju.weebly.com/uploads/1/3/4/1/134109261/nimorevokupagixixile.pdfIn PDF document text
    • https://gimepokik.weebly.com/uploads/1/3/1/6/131636980/1dc4a45872d335.pdfIn PDF document text
    • https://luvodufugatese.weebly.com/uploads/1/3/4/8/134893210/tuvulego.pdfIn PDF document text
    • https://kasadinup.weebly.com/uploads/1/3/4/6/134641165/8119621.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/4ccc8da9-9384-447b-b67e-375f8701dd51/how_to_setup_voicemail_on_nec_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/130ae8ca-b7d6-4a6b-9084-ce8e685801b4/lafedotonuwamutew.pdfIn PDF document text
    • http://zofumorejo.epizy.com/does_red_cross_check_blood_for_covid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03007edf-b30b-4b8c-ae0e-5e282bddb7c6/39180145603.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3712ef6-d8f7-4d8d-bd5a-c561d6f663f4/siwokozogopojefobebo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/214b517c-266b-48ff-bdad-0fef8ad56ee3/newiwowif.pdfIn PDF document text
    • http://guruwemuzotal.epizy.com/wargaming_game_center_slow.pdfIn PDF document text
    • http://mukananadab.epizy.com/dijuredokajivos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1232cb05-6d22-4677-afe2-6fbfd493d757/kuriv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7f96284-844c-42da-944e-60ec84a6a77b/how_to_analyze_handwriting.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF86 5256 bytes
SHA-256: 8c13a743b627fdf54137941d450f1c1e1de63802eb4486bb98879a27cc000cff
font_01_sfnt_off00011163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11163 11152 bytes
SHA-256: 6ad8544554ea60e05d3f4ddae1451c437023b4285a6154159e40e71e43a67076