Malicious PDF — malware analysis report

Static analysis result for SHA-256 e529c792619471b5…

MALICIOUS

PDF

77.6 KB Created: 2021-01-13 17:53:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 31bd958eabd5fa610dc0cd381c89c1b6 SHA-1: dd429fec1e387e48bb4dd622833ff598547bbefc SHA-256: e529c792619471b5020a64abb1c44e7d645099015113a1203e979cc19194dc98
184 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The document contains numerous embedded URLs, many of which point to disposable hosting and are designed to appear as legitimate document titles or search results, indicating a phishing or scam attempt. The ML classifier also strongly indicated maliciousness.

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://cctraff.ru/aws?utm_term=income+guidelines+for+medicaid+colorado+2019 In PDF document text
    • https://site-1176552.mozfiles.com/files/1176552/13323732632.pdfIn PDF document text
    • https://site-1173985.mozfiles.com/files/1173985/new_army_pt_test_standards_by_age.pdfIn PDF document text
    • https://site-1188796.mozfiles.com/files/1188796/crusades_ap_world_history_definition.pdfIn PDF document text
    • https://site-1176701.mozfiles.com/files/1176701/ludogorets_fc_results.pdfIn PDF document text
    • https://site-1216802.mozfiles.com/files/1216802/perotibimal.pdfIn PDF document text
    • https://site-1172435.mozfiles.com/files/1172435/22395503843.pdfIn PDF document text
    • https://site-1178471.mozfiles.com/files/1178471/moneygram_uk_online_chat.pdfIn PDF document text
    • https://site-1168413.mozfiles.com/files/1168413/zoo_craft_animal_family_hack_apk_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380691/normal_5fe2e1dee5011.pdfIn PDF document text
    • https://site-1174506.mozfiles.com/files/1174506/dirivuzonokit.pdfIn PDF document text
    • https://site-1174464.mozfiles.com/files/1174464/fiori_design_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388613/normal_5fa68e345c40e.pdfIn PDF document text
    • https://site-1166608.mozfiles.com/files/1166608/bekum.pdfIn PDF document text
    • https://site-1176337.mozfiles.com/files/1176337/95159723246.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000efcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCB 5760 bytes
SHA-256: 1d4b48d7da815aebe54c7c47eb3b76bf2bf01c17745e23032621569cc7770877
font_01_sfnt_off00010356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10356 11520 bytes
SHA-256: 757980d65cdaeb224725b94f50a76d6429917905e38805c430794feba49cf902

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