Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d53ed5e0101db9c…

MALICIOUS

PDF

83.7 KB Created: 2021-06-07 14:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c099b1fb35dda565594be9606df0571c SHA-1: d966bbfe0f4c08b4d9cee653702d8319cd570ca1 SHA-256: 5d53ed5e0101db9cb02965d141ff888bd0f3e305d1abfafc7e71c8450c51bbc4
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The embedded links, such as 'https://yafferge.ru/123?utm_term=diabetes+australia+management+guidelines', suggest a phishing or content-scraping attack. The presence of numerous external links indicates a link farm designed to manipulate search engine results or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yafferge.ru/123?utm_term=diabetes+australia+management+guidelines
    • https://fubediko.weebly.com/uploads/1/3/1/0/131070718/gimojaxowevozalesora.pdf
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/9c027.pdf
    • https://soporivuduburem.weebly.com/uploads/1/3/5/3/135346591/gatalelotesuse-bujifetirixamel.pdf
    • https://sapatipiragibo.weebly.com/uploads/1/3/4/7/134708637/df16358.pdf
    • https://gepavemu.weebly.com/uploads/1/3/4/8/134861499/9586167.pdf
    • https://lobevebuwavija.weebly.com/uploads/1/3/4/3/134394718/3696426.pdf
    • https://gebotela.weebly.com/uploads/1/3/4/3/134318039/6356963.pdf
    • https://kofasarafafe.weebly.com/uploads/1/3/5/3/135390193/tedimolejoxig.pdf
    • https://notokawuwo.weebly.com/uploads/1/3/4/8/134856920/jenuxi.pdf
    • https://tarivoda.weebly.com/uploads/1/3/4/6/134693378/wididosejukarasavan.pdf
    • https://golisarupu.weebly.com/uploads/1/3/5/3/135317681/f8a664b845.pdf
    • https://xowedoditigivi.weebly.com/uploads/1/3/4/7/134714126/jikusubabi.pdf
    • https://tubumafipe.weebly.com/uploads/1/3/4/4/134458357/dafuv-wexujepuponuzi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ae803508-321d-453b-8f93-252350479106/piradusoribufusemolalaru.pdf
    • https://uploads.strikinglycdn.com/files/2f6e1a86-88fb-4056-bf09-653f96db4cde/kirolure.pdf
    • https://uploads.strikinglycdn.com/files/71510c66-81f4-4b2e-9622-f56f7c67c74a/dbt_house_template.pdf
    • https://uploads.strikinglycdn.com/files/7698c5e4-3297-4811-84eb-e86216416757/notuzalojukoxowogezafizo.pdf
    • https://uploads.strikinglycdn.com/files/44b4c09e-0b4e-4f3b-ac10-dd203ac7be65/butikiwuvetisaketi.pdf
    • https://uploads.strikinglycdn.com/files/12c396dc-4f86-4b9c-838e-e26096ad0d5c/places_to_donate_furniture_in_nj.pdf
    • https://uploads.strikinglycdn.com/files/6a6602f0-ecb4-494c-97df-e1dbf2895442/duxozafirufokixumixun.pdf
    • https://uploads.strikinglycdn.com/files/2eed0f30-0326-4fc2-afe9-e029d7be93ae/tijiripe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109a9.bin
617f209f79b0ea8c5d2dc82f0274a1184b6b21936357490367caf5862252cb27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109A9 5284 bytes
font_01_sfnt_off00011b8a.bin
525a2ef7d9a46cc3d027d5612ee3c389614d3aadc949371f7cc18fb7055e51ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8A 11156 bytes

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