Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d9e31c1c1e7b9c4…

MALICIOUS

PDF

78.3 KB Created: 2021-03-19 20:18:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a237600a5eb1cb64b8729ede587494a4 SHA-1: 88cc75c3eb452d6aebbedb60456ab7cce6020608 SHA-256: 9d9e31c1c1e7b9c4c3c1427afc9aec8727eed83ff9294056e26318230ecdc303
244 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content, such as the malicious domain dafemum.ru. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create SEO spam or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://dafemum.ru/strik?utm_term=around+the+world+in+80+days+movie+jackie+chan In PDF document text
    • https://lugeluwad.weebly.com/uploads/1/3/4/3/134328935/xolad.pdfIn PDF document text
    • https://vodazifuja.weebly.com/uploads/1/3/4/2/134265633/ee390fb63b46.pdfIn PDF document text
    • https://bezofaxifi.weebly.com/uploads/1/3/1/6/131606652/3814bca74602.pdfIn PDF document text
    • http://sijubuwejipamun.mywebcommunity.org/what_is_place_value_in_math_1st_grade.pdfIn PDF document text
    • http://mesikigodijope.mypressonline.com/capitalism_in_america.pdfIn PDF document text
    • http://lazategomid.scienceontheweb.net/cannaceae_family.pdfIn PDF document text
    • http://xteenware.online/19446581511ddtgh.pdfIn PDF document text
    • http://life50it.pro/metodologia_de_la_investigacion_quinta_edicion_aoldmgo.pdfIn PDF document text
    • http://lerob.info/visual_elements_and_principles_of_design_matrix_coffee_makerp25k8.pdfIn PDF document text
    • https://razavewi.weebly.com/uploads/1/3/0/8/130813306/kevuguwijix-rusiw-kulomem-jaburide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f579be4a-c2ec-451d-94ee-532237c06880.filesusr.com/ugd/9f6a24_e5527ff24b9643c4801da71c7a9a655c.pdf?index=trueIn PDF document text
    • https://a54de82d-0003-4787-801b-d7ee719c780a.filesusr.com/ugd/8d57bd_152c6a025d9c487f929d697f8861a36e.pdf?index=trueIn PDF document text
    • https://16012499-1299-48b0-8cdd-5f23a7749958.filesusr.com/ugd/fafc38_3c9357fcc1b44a958bfcc6411946071f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/salade/19270382163.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/vorizikesotogemosopi.pdfIn PDF document text
    • http://zonafikepejese.onlinewebshop.net/zagofigebe.pdfIn PDF document text
    • https://3857ddc0-2b33-46ba-b4a8-ebef9b167687.filesusr.com/ugd/5cc0d5_959444cb7afc45099dd5ffdad1ce7a78.pdf?index=trueIn PDF document text
    • http://fataragoreb.myartsonline.com/57663478287.pdfIn PDF document text
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_bbf364d73d5644c992ea5995c7621d99.pdf?index=trueIn PDF document text
    • https://8f1ef4f7-3f23-41ef-a3d6-4e5873a175a2.filesusr.com/ugd/d318ce_a6090a3f508049f586ef4babe5925b0b.pdf?index=trueIn PDF document text
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_a6b65e972eb24550a69beead10282fc8.pdf?index=trueIn 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_off0000eed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED2 5896 bytes
SHA-256: f535ed313acbf9b246b54c608a309e4f7c3632ea700ee08c133308489969e6ee
font_01_sfnt_off000102e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E0 12320 bytes
SHA-256: bdb8c1f143d2620498b97684d10d0d45c12c3992ba8d1bac29cfb5b631395ab3

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