Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b23a1f95f375fb…

MALICIOUS

PDF

81.1 KB Created: 2021-01-13 06:54:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ba5861a339ea6f117c2d516661dcb785 SHA-1: 7fb702a356b0babdde959b0bf795e36c0fe123ad SHA-256: 90b23a1f95f375fb91ca1e3b6a4dd147cb1cbd3ed99df321d2cf1283cf0a7c54
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical alert for redirecting to known malicious infrastructure and a machine learning model indicating a high probability of maliciousness. The presence of numerous links to disposable hosting and a specific malicious redirector URL strongly suggests a phishing or scam campaign. The ClamAV detection further corroborates the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffking.ru/123?utm_term=isoline+map+ap+human+geography In PDF document text
    • https://dagevonedil.weebly.com/uploads/1/3/4/7/134736192/zutikuxamuvov.pdfIn PDF document text
    • https://site-1244857.mozfiles.com/files/1244857/26406469296.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403804/normal_5fc31515ab3a5.pdfIn PDF document text
    • https://site-1172723.mozfiles.com/files/1172723/25146024007.pdfIn PDF document text
    • https://site-1174609.mozfiles.com/files/1174609/gakoratidola.pdfIn PDF document text
    • https://site-1199448.mozfiles.com/files/1199448/1990683680.pdfIn PDF document text
    • https://site-1187779.mozfiles.com/files/1187779/adairs_flannelette_sheets_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367621/normal_5fa39ef8ccb17.pdfIn PDF document text
    • https://ruwadegefanum.weebly.com/uploads/1/3/4/1/134108857/goxepadokemibofodu.pdfIn PDF document text
    • https://site-1176140.mozfiles.com/files/1176140/grand_central_terminal_nyc_facts.pdfIn PDF document text
    • https://site-1180367.mozfiles.com/files/1180367/stick_war_legacy_hack_3_mod_apk.pdfIn PDF document text
    • https://site-1177316.mozfiles.com/files/1177316/74703227145.pdfIn PDF document text
    • https://site-1168098.mozfiles.com/files/1168098/31505471085.pdfIn PDF document text
    • https://site-1178182.mozfiles.com/files/1178182/34980284107.pdfIn PDF document text
    • https://site-1177775.mozfiles.com/files/1177775/18792153961.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/jexijer/king_root_apps_for_android.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8F 5272 bytes
SHA-256: 228f0c02c589ca9074737ea59b2d46310324d6da4de6b0b0f893bf43595ff756
font_01_sfnt_off0000dd50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD50 10540 bytes
SHA-256: 14ff0cbcf9e33122419acddff0e7af95fd440b1226761aff937c938ff21ff0a8
font_02_sfnt_off0000fe38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE38 10016 bytes
SHA-256: be361c1c3025c9d73fa59888202903399ed2da148fd1f2b9f4524e2b87933eb4
font_03_sfnt_off000120cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CF 16272 bytes
SHA-256: a0268c527bba217ff8d91bd04ff340da6b945387e1f31ab90608afff29d078bc

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