Malicious PDF — malware analysis report

Static analysis result for SHA-256 b450eba0baee2d2d…

MALICIOUS

PDF

72.3 KB Created: 2021-03-21 21:42:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 057a13dd034714006c73f2eb123629d5 SHA-1: b0ab826be0690da919fb99c2c9c3c98ae508e940 SHA-256: b450eba0baee2d2d3874968f704af00d2274a7d36cabd566d5cc873d1819fd00
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with at least one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, appears to contain references to tutorials, suggesting a lure to trick users into visiting these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/aws?utm_term=gba+ags+101+mod+tutorial In PDF document text
    • https://static.s123-cdn-static.com/uploads/4367922/normal_5fe3e0e57573b.pdfIn PDF document text
    • http://lofitner.buzz/learn_hangul_alphabetkldem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475215/normal_5fe4b4880b865.pdfIn PDF document text
    • http://kindraretterath.com/43228577459cr3c4.pdfIn PDF document text
    • http://pogekoxuw.mygamesonline.org/de_broglie_wavelength_equation.pdfIn PDF document text
    • http://siwivelijutore.medianewsonline.com/ninonodajas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459481/normal_6052a5e9416e9.pdfIn PDF document text
    • http://clientbluebadge.com/xekerizifanilinozusuwobuztbnh.pdfIn PDF document text
    • https://nipixosawapur.weebly.com/uploads/1/3/1/1/131164079/bibekagovurug.pdfIn PDF document text
    • http://gazagidumow.mygamesonline.org/iso_iec_27001_audit_checklist.pdfIn PDF document text
    • http://vuvuga.xyz/69011477210udlce.pdfIn PDF document text
    • https://bosesabefo.weebly.com/uploads/1/3/4/3/134362720/jilonuraz.pdfIn PDF document text
    • http://pirewarekow.mywebcommunity.org/57528901048.pdfIn PDF document text
    • http://idealica-italiaufficiale.site/51537235991foqnj.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/1841c4fe-eb46-41bc-acaa-efe9c0da2927/25193185160.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43585a20-b449-4f13-8474-6b2102e7c791/how_to_win_the_lottery_uk_guaranteed.pdfIn PDF document text
    • http://kifinuneniw.rf.gd/can_you_hook_up_2_tvs_to_one_dish_receiver.pdfIn PDF document text
    • http://zelixaxiki.rf.gd/xenapozib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7011d0d5-ae87-4c1b-93fe-bc05bb21809b/how_to_stretch_plantar_fasciitis_before_running.pdfIn PDF document text
    • http://tegemikewik.rf.gd/sheetz_grocery_loyalty_card.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2267465-c972-4cee-bfc8-4e8d808ba952/pujovesom.pdfIn PDF document text
    • http://boloxevukizuf.rf.gd/subanugefot.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_off0000dd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6E 5512 bytes
SHA-256: 0dfb230903655500323b144e0ab883d5169c5068d8aea3da80234e486a68f872
font_01_sfnt_off0000f011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF011 10452 bytes
SHA-256: 5210b78e5724fc45a901d70c06fae4786a53550dca5b84ae956b09c23d707578

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