Malicious PDF — malware analysis report

Static analysis result for SHA-256 cac10c7029f78233…

MALICIOUS

PDF

70.4 KB Created: 2021-01-19 22:35:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9e153d0070e5f4198446d2682b00d94a SHA-1: 7c7b167fbfebdc3dc4e8e1c88ae8b5198f3716ea SHA-256: cac10c7029f78233ba1f95c5dc8ed951b0fdcec68ab6cfb92b5d12e0991fa763
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to be a lure related to search terms, suggesting a phishing or scam attempt. No scripts were extracted, but the presence of malicious links indicates an intent to redirect the user to a harmful site.

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://traffmen.ru/123?utm_term=billie+jean+meaning+pop+smoke In PDF document text
    • https://static.s123-cdn-static.com/uploads/4416301/normal_5ff3be62e74d2.pdfIn PDF document text
    • https://site-1173181.mozfiles.com/files/1173181/horizon_t202_treadmill_australia.pdfIn PDF document text
    • https://site-1173386.mozfiles.com/files/1173386/62778983865.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413368/normal_5fb32d7637159.pdfIn PDF document text
    • https://site-1177111.mozfiles.com/files/1177111/91874367113.pdfIn PDF document text
    • https://cdn.sqhk.co/tefozakozup/ic9ghxV/evil_horror_monster_2.pdfIn PDF document text
    • https://site-1168252.mozfiles.com/files/1168252/ralusuxigazovojosatik.pdfIn PDF document text
    • https://site-1177224.mozfiles.com/files/1177224/extra_care_oximeter.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372073/normal_5fc498e7ae833.pdfIn PDF document text
    • https://site-1173612.mozfiles.com/files/1173612/29624109174.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393044/normal_5f92808ea2226.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373749/normal_5f98697720386.pdfIn PDF document text
    • https://site-1168349.mozfiles.com/files/1168349/28645148968.pdfIn PDF document text
    • https://site-1171372.mozfiles.com/files/1171372/lerujirudupovujoro.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/limewub/52200114850.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/75524477590.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_off0000d63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63A 5232 bytes
SHA-256: eeea89fb98a7fa52274df06086f520f738fdd05143b7429f917522654db8412b
font_01_sfnt_off0000e803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE803 10796 bytes
SHA-256: ff4fe5f5efd98df6e9001a849ee4465c06faf45c2271074a684abdea1ac4e445

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