Malicious PDF — malware analysis report

Static analysis result for SHA-256 d364b2aa50ccb556…

MALICIOUS

PDF

69.0 KB Created: 2020-11-23 12:32:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad15590d7c958cfa0ab55c9d8ab2af3b SHA-1: 17b52d867f842ecab463cabf4b50ab7e26058d43 SHA-256: d364b2aa50ccb55622f68b990fc96a1719de6a29a99e0aca7c9ec56e70987ecf
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure and a high-confidence ML classification. The document contains a large number of embedded URLs, suggesting a link farm or phishing attempt. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gettraff.ru/strik?utm_term=ejercicios+resueltos+del+teorema+de+pitagoras
    • https://tibiwurab.weebly.com/uploads/1/3/2/6/132695994/jogidop-zufokasugasefu.pdf
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/ec092f50519.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8ae46ad8-5e40-4b90-9ccc-b8e88a59df28/lepiwaperevulavuve.pdf
    • https://s3.amazonaws.com/xalexojaxipud/free_color_by_number_pictures_to_print.pdf
    • https://s3.amazonaws.com/pezofut/sharp_carousel_2_convection_oven_manual.pdf
    • https://s3.amazonaws.com/wizuluworafid/static_electricity_worksheet_grade_9.pdf
    • https://uploads.strikinglycdn.com/files/f1eddd98-e2f2-44bb-a14a-695b1a6d609c/hentai_gallery_manga.pdf
    • https://uploads.strikinglycdn.com/files/00b9f4c7-412c-4b63-91eb-ef260e652fd4/deez_nuts_bout_it_download.pdf
    • https://s3.amazonaws.com/minegikukovel/79010476171.pdf
    • https://uploads.strikinglycdn.com/files/2e382f6f-5fdf-445e-8562-675863ba2dd3/sedat_uan_annem_ilahi_mp3_indir.pdf
    • https://s3.amazonaws.com/fifomi/kukasowisidis.pdf
    • https://uploads.strikinglycdn.com/files/2babd5c4-6708-4d3c-8a00-27f805b3e05a/48971925149.pdf
    • https://s3.amazonaws.com/sugaguxagu/maths_formulas_for_class_10_samacheer_kalvi.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_off0000ce21.bin
ed7e92dad9f7e6d1971c9f8db61ea0f027ba0b8579992314a643b1bd4c988dba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE21 5428 bytes
font_01_sfnt_off0000e07f.bin
2650bd9d4aa22a33d1510c4db8accbc7873039a0435793440fcf832977bbfc94		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE07F 11292 bytes

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