Malicious PDF — malware analysis report

Static analysis result for SHA-256 3953594d868e32ae…

MALICIOUS

PDF

97.7 KB Created: 2021-03-25 07:25:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b5a9e879dd045c832179e87fcf0b6d92 SHA-1: 78c00d1ded2e08cd6a7f4700b935f900f80e4fd4 SHA-256: 3953594d868e32ae3f4b09762035c9174b562bc6e175f5cb1f67b004a633a00a
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were extracted, the presence of malicious links and the document's structure suggest it's designed to trick users into visiting harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/wix?keyword=inorganic+and+organic+chemistry+worksheet+answers In PDF document text
    • http://wojozaxoxofomel.22web.org/54000618073.pdfIn PDF document text
    • http://sazulido.medianewsonline.com/kufejaberuvorizujazaromi.pdfIn PDF document text
    • http://tufataf.22web.org/80749346628.pdfIn PDF document text
    • http://teachersaid.fun/honeywell_rth2300b_manuallm6vg.pdfIn PDF document text
    • http://kifisafobubupo.mygamesonline.org/canterbury_tales_prologue_middle_english.pdfIn PDF document text
    • https://cdn.sqhk.co/vavewiren/heOSjbg/60251442842.pdfIn PDF document text
    • https://cdn.sqhk.co/sojejinof/elAhjXZ/punuluviliwez.pdfIn PDF document text
    • http://nigoguno.scienceontheweb.net/what_is_a_centrally_planned_economy_definition.pdfIn PDF document text
    • http://rogijowop.sportsontheweb.net/xefixerex.pdfIn PDF document text
    • http://gevixadita.22web.org/48762006042.pdfIn PDF document text
    • http://zubiki.top/276112159356oz2f.pdfIn PDF document text
    • http://bluebadgeform.com/netgear_wndr3300_speedf8pkx.pdfIn PDF document text
    • http://olymptrade.buzz/vujogufewujetigamoresimrm9mu.pdfIn PDF document text
    • http://ruluzuzadol.mypressonline.com/isentropic_efficiency_reciprocating_compressor.pdfIn PDF document text
    • http://mumopajikex.mygamesonline.org/brain_anatomy_textbook.pdfIn PDF document text
    • http://nogurufegu.mygamesonline.org/le_role_de_l_assemble_nationale_du_sngal.pdfIn PDF document text
    • https://cdn.sqhk.co/rozamulev/u7zhdL8/41112302132.pdfIn PDF document text
    • http://bapupozizevose.22web.org/zidikavorozewirijobaw.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nasakil.rf.gd/html5_input_file.pdfIn PDF document text
    • http://relumewamamit.rf.gd/durable_power_of_attorney_for_financial_form.pdfIn PDF document text
    • http://zekovulelopur.epizy.com/bollywood_all_romantic_movies.pdfIn PDF document text
    • http://pokupila.rf.gd/pigopugisujane.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
stream_004_off00011fd8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11FD8 25104 bytes
SHA-256: 4ea0ab13e58167a485bb665600bf56a81dfd4d08479a24d33331e41ad5ab0099
font_00_sfnt_off00010d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D30 5516 bytes
SHA-256: dd9fe42ebbeb2cc67ac76ce413c444220a4d826765c7c726fc7c079a32ab6401
font_02_sfnt_off000153dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153DC 10736 bytes
SHA-256: 1fe68040f8f241dcb62e74400c985241264f3f660d8d151bed20653d693bd835

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