Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e39c74967139a4…

MALICIOUS

PDF

78.6 KB Created: 2021-03-20 10:38:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d6adedc4788f2f1a5e0c891adcb4c664 SHA-1: ca85e045967cb1a54e6874dfd6fb3c10a7394b24 SHA-256: 88e39c74967139a456bfaa7fcf135e20770d261669665cf967222b31517b49d3
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 links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it might be a generated document used to mask malicious links.

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
  • 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=burndown+at+sundown+2019 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383327/normal_5fdb29a08f87c.pdfIn PDF document text
    • http://chuvashovfamily.ru/93207353253pwf2l.pdfIn PDF document text
    • http://fitukogamoj.iblogger.org/xetixibixolufiti.pdfIn PDF document text
    • http://wisatemubudu.medianewsonline.com/23136313348.pdfIn PDF document text
    • http://faxozulakevosos.iblogger.org/cisco_ios_ip_routing_bgp_configuration_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372104/normal_602711bc34af3.pdfIn PDF document text
    • http://gexopidikimo.mygamesonline.org/31903746543.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450353/normal_60347094e6d56.pdfIn PDF document text
    • http://zexaribamemavi.sportsontheweb.net/eight_limbs_of_ashtanga_yoga_in_marathi.pdfIn PDF document text
    • http://lokotahas.ru/50_shades_of_grey_trailer_3_deutschech14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471941/normal_60538e1ccd63d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/godewumazek/gimetimoke.pdfIn PDF document text
    • http://golinab.rf.gd/delta_table_saw_motor_62-044.pdfIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/sheetrock_metal_corners.pdfIn PDF document text
    • http://wetizizokixo.epizy.com/resumen_del_capitulo_11_del_libro_el_arte_de_la_guerra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7d398c8-255c-4690-9b8e-1600ab90875a/zedaduwami.pdfIn PDF document text
    • http://mageparojepu.epizy.com/ready_reckoner_english_grammar_book_in_gujarati.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c72e8f94-e349-419f-be01-aa754b035c5f/40557632140.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e57e089-4b3f-48fb-ab04-3cc5a4f5b373/43508881537.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E0 5408 bytes
SHA-256: ad0d9d242ed69f24a4c7d16e0ea10a42c0d28162918f94d02e37c20d0ad14bb9
font_01_sfnt_off00010763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10763 11336 bytes
SHA-256: f51e926dd24cd9ff56c24da109ca818b5b38a7c903282551fc1ed6001431bdb8

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