Malicious PDF — malware analysis report

Static analysis result for SHA-256 b22f451dc87e048a…

MALICIOUS

PDF

72.0 KB Created: 2021-02-20 03:24:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5bb90995cd9c57f6a3ea0e5002705f8e SHA-1: 812c9b04bebda94d2b3f17e972f0ae3703c318ba SHA-256: b22f451dc87e048a94d4e86758cf53453ca6c56f46527509d0a8c705ca169ee0
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary suspicious URL pointing to 'jottigo.ru'. Heuristics indicate the PDF is a link farm on disposable hosting, and ClamAV detected it as 'Pdf.Phishing.Trojan'. The ML classifier also strongly flagged it as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/wix?keyword=battle+queen+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384152/normal_60144bf51d4e8.pdfIn PDF document text
    • https://gobodukigibab.weebly.com/uploads/1/3/1/8/131856162/kotodarawomuburu.pdfIn PDF document text
    • http://werategaxa.iblogger.org/corrugated_metal_wall_sheets.pdfIn PDF document text
    • http://bilkaita.space/icc_500_storm_shelter58119.pdfIn PDF document text
    • http://lapuxuzogu.22web.org/73754989883.pdfIn PDF document text
    • https://xapenivivafozeb.weebly.com/uploads/1/3/1/3/131379266/kizopu.pdfIn PDF document text
    • http://perugujusebirir.22web.org/block_puzzle_no_ads_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kezulixu.rf.gd/31850879991.pdfIn PDF document text
    • http://gaxokumixopo.epizy.com/23660491000.pdfIn PDF document text
    • http://molulig.epizy.com/alarm_setting_ing.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/iosh_risk_assessment_form_doc.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD304 4580 bytes
SHA-256: f140167fbcac58c9e4a6f7bb6636bb7692153d47c93e55fe4b85507d9a5b79c5
font_01_sfnt_off0000e2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A5 10288 bytes
SHA-256: db22d43aa213fd2c1d57570aa02b8650f83d444f1adc9b7ddec2dd84ab64d971
font_02_sfnt_off000105b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B8 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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