Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca37d5cd7fbd8243…

MALICIOUS

PDF

74.1 KB Created: 2021-02-28 03:58:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 28a8c114aa7d89c4d4250ae00c1f2e1e SHA-1: a089c212f45848c669595dcd9c252416d1d9ccf9 SHA-256: ca37d5cd7fbd82430a59cac2d683d2654cd661d2cbaac04663fbecf9cb56b287
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are hosted on disposable domains and are associated with link farms, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the PDF structure and embedded URLs point towards a social engineering attack.

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://dugedepap.ru/strik?utm_term=homelite+leaf+blower+hard+to+start PDF link annotation
    • http://momentikshop.space/mezilofulepifuleragulquvje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389104/normal_602c7844991f1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378175/normal_5ff2d6547dd8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476590/normal_601fe415b0e9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418783/normal_6020631ac36d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477164/normal_5ff133e442c0b.pdfIn PDF document text
    • http://difuwikikum.iblogger.org/wekajuf.pdfIn PDF document text
    • http://copyright-rules-help.com/how_to_draw_a_christmas_tree_and_star_easy_and_cute4rba1.pdfIn PDF document text
    • http://instapodarok365.site/pm_awas_yojana_online_application_form_2018byxp1.pdfIn PDF document text
    • http://winoorama.fun/25373730858tpd7y.pdfIn PDF document text
    • http://shop-onlinediscount.xyz/6900126479te4fv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426425/normal_6001f8ce20b56.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/zumezeviwakiz/79607586595.pdfIn PDF document text
    • http://rabopusafat.epizy.com/ryzen_2600_oc_guide.pdfIn PDF document text
    • http://jirizaxewusi.epizy.com/ketudevazegelabira.pdfIn PDF document text
    • http://renedutej.rf.gd/29293133367.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/vizab.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/acta_constitutiva_de_un_proyecto_formato.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/kenixosokikofisupi.pdfIn PDF document text
    • http://fulovefodib.epizy.com/29482303321.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_off0000e408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE408 5340 bytes
SHA-256: e21ff154a64d482b1dd7a4fdbd455ed6618f578b44c891bd06377b8521f09d75
font_01_sfnt_off0000f610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF610 10784 bytes
SHA-256: c0d63fa8c588610d70190d0024bb59c5d1169390fc087a2f1b4b689c2cf44a0c

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