Malicious PDF — malware analysis report

Static analysis result for SHA-256 575222c5fa4a87aa…

MALICIOUS

PDF

102.4 KB Created: 2021-03-19 21:32:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 84c346911de46c8990e02f915a71202e SHA-1: 5c0b2e4fc46aa0a264edc594b09e5aee1035d038 SHA-256: 575222c5fa4a87aa7439606f5d933b59ba71b8305f67f898ff29e0e05a44448c
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, with a primary suspicious URL pointing to a link farm on disposable hosting. The document body, though heavily obfuscated, suggests a lure related to educational materials, likely to trick users into clicking the malicious link.

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://dugedepap.ru/award?keyword=grade+9+algebra+worksheets+with+answers+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369512/normal_5fca1fe8661e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479715/normal_5fdf661f4586f.pdfIn PDF document text
    • http://julivojurukumu.sportsontheweb.net/irobot_roomba_s9_black_friday.pdfIn PDF document text
    • http://wazepewazivulil.mywebcommunity.org/breathe_in_cash_out.pdfIn PDF document text
    • http://vukufitu.mywebcommunity.org/what_meals_are_good_for_gout.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://jaxuziwemulogel.rf.gd/96870694346.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/biology_notes_form_3_reproduction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70f029fb-57b4-41ba-8b58-44b69ca34943/barodasetajakibif.pdfIn PDF document text
    • http://wasofiwomorap.epizy.com/90207720666.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07c07237-c1f4-47fe-b9b6-18734ae320e3/35477843453.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d60e1d1-50c1-4e21-8cca-170f3819ba60/41073529264.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8a16a10-40b0-4596-bc98-9ea87df6b88a/tanevadularerijaxufaxixab.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/54187256021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/708a081c-df20-4df0-96e7-65dd9fd12b7b/buwaran.pdfIn PDF document text
    • http://xopemaw.rf.gd/4106011366.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a575ce8-2891-4362-a806-634a26a43cd6/58173531452.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/jalikusakeludurikiriduke.pdfIn PDF document text
    • http://wifeloli.epizy.com/48563863819.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_off0001476b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1476B 5572 bytes
SHA-256: 12fd6cee5aea32c775893e9191b571bb87c92f36a24316c72f711660da4f645b
font_01_sfnt_off00015a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A6C 10560 bytes
SHA-256: 99e84bbfb84bdf434ed16cd4f9a5e82b86b1b8ec4a2e57488c34052c86244028
font_02_sfnt_off00017e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E36 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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