Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed94f7136a61f8d7…

MALICIOUS

PDF

76.8 KB Created: 2021-03-05 02:51:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5efcff73a9d593ff2c07393020e55fb3 SHA-1: e176c713a5875c7e62ab992ae94946faba362157 SHA-256: ed94f7136a61f8d7aa6e411a56604c42239b3199419020e5e561ff1a4bf34749
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm likely used for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, with the PDF being identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and heuristics point towards it being a delivery mechanism for potentially harmful content.

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
  • 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.
  • 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://kuzutuzo.ru/strik?utm_term=presto+electric+skillet+walmart PDF link annotation
    • https://jivenikovo.weebly.com/uploads/1/3/4/3/134308789/faforob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386095/normal_601e565b48613.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460045/normal_60268e548c68e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404313/normal_5fcbdc350948e.pdfIn PDF document text
    • http://sunakijabe.sportsontheweb.net/sistema_muscular_humano_para_nios.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445128/normal_60257840eb61f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366360/normal_6037040a32969.pdfIn PDF document text
    • http://labifovejes.mypressonline.com/wacker_neuson_spare_parts_catalogue.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451563/normal_600d7173521cc.pdfIn PDF document text
    • https://murafasonuralab.weebly.com/uploads/1/3/5/3/135398902/zuduno.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450345/normal_5fc92056a1918.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413564/normal_5ff3fea740804.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gekidajup.epizy.com/42806363425.pdfIn PDF document text
    • http://wepaxilex.epizy.com/temario_auxilio_judicial_adams.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50c48536-fb21-414b-b5c3-29a7f49913d1/muwikaxux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63436875-568d-41c6-a4fb-9e89cdee182e/valagerejopisokasari.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6102769-6b7d-496a-a2af-e88376ee753d/why_is_fair-minded_critical_thinking_necessary_in_multicultural_teaching.pdfIn PDF document text
    • http://mipuvofelope.epizy.com/71600179234.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dafc821b-0f35-4c65-b134-2c31e2dd1f4c/what_is_fundamental_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9db61074-d001-4a2d-84e8-35f8289a4ba6/alinco_dx-sr8t_vs_dx-sr9t.pdfIn PDF document text
    • http://rasiritodir.rf.gd/lipumuzetutekowizavozalu.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_off0000eef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF6 5104 bytes
SHA-256: c688b3ca5608f7fd32a58ed2c1ed526bcb2e03649f0db3b4e3dbf922ae769c21
font_01_sfnt_off0001004c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004C 11456 bytes
SHA-256: 91b57e89644da23c84c2f3bb034e698da50bdf559459b7c5213b6fb3d3cf0468