Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9007d0a541e187f…

MALICIOUS

PDF

77.1 KB Created: 2021-04-02 05:40:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: f04b735de954a31411f1c3f041d1bbca SHA-1: 538ce977f84e0bea86d7cd7c191ccf4a56b901c3 SHA-256: b9007d0a541e187fb2cab9b74c7ab8cb5fb537d64e23c4117d9e83e5c3687882
184 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV also flagged this file as malicious. The primary malicious URL identified is https://dafemum.ru/strik?utm_term=bob+evans+catering+breakfast+menu, which is likely used to deliver a phishing page or a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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=bob+evans+catering+breakfast+menu In PDF document text
    • https://static.s123-cdn-static.com/uploads/4414176/normal_5fce745857f2a.pdfIn PDF document text
    • http://tb-films.ru/pipixijetijasuc3dp.pdfIn PDF document text
    • https://wipamixupes.weebly.com/uploads/1/3/4/4/134460990/dubix_javotibomo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469358/normal_5fc8d2344badc.pdfIn PDF document text
    • https://baxukeze.weebly.com/uploads/1/3/0/8/130874478/b8fdc211d.pdfIn PDF document text
    • http://gazzsheff.xyz/html_form_post_radio_button_valuebcu0q.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367281/normal_5ffbab2605b02.pdfIn PDF document text
    • http://genusadnlo.space/In PDF document text
    • https://pusemajipi.weebly.com/uploads/1/3/4/4/134471733/151167.pdfIn PDF document text
    • http://instapodarok365.site/recharge_strength_prewoezckq.pdfIn PDF document text
    • http://fapasevusiledap.mygamesonline.org/zinarozewomowa.pdfIn PDF document text
    • https://gonerogad.weebly.com/uploads/1/3/1/4/131438616/surilat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482190/normal_5fd3dc767ed4c.pdfIn PDF document text
    • http://vykupavto54.ru/kabepixafebovedujemfk1tp.pdfIn PDF document text
    • http://warokibujiz.getenjoyment.net/48690289881.pdfIn PDF document text
    • http://clebohets.xyz/can_you_have_carbs_with_keto_dietga7i1.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/2823c1fd-36bf-400f-bf9d-ae3f5f8694bc/50502000145.pdfIn PDF document text
    • http://vefodipox.myartsonline.com/85378369428.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28ab4dc9-be83-46ea-887e-96706d4080de/bikabobubigo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb6e9cfc-a7bc-4e6c-a846-a05a5198540e/how_to_get_oracle_sql_certification.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_off0000ebef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEF 5484 bytes
SHA-256: ad6f2853834f7cc1800dc276f2d3237a5842d730550109b7d5588118bb84df55
font_01_sfnt_off0000fe96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE96 11316 bytes
SHA-256: 56b521860e231b30e73d64264690ba1093d6f2265b1531267da6aa5bcfa404f0

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