Malicious PDF — malware analysis report

Static analysis result for SHA-256 e20ed4a0b8b153bb…

MALICIOUS

PDF

72.0 KB Created: 2021-01-16 14:27:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: f22aaa1583e3c6acd3df22196eb074c3 SHA-1: 3155fa53c87062523c211eb5d964c1de0bf475bc SHA-256: e20ed4a0b8b153bbe9a96d7922735487aafcdea4e60c784c347664fa632c77f9
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm, directing users to external resources. One critical heuristic specifically flags a link to known malicious redirector infrastructure, indicating a phishing or malware distribution attempt. The ML classifier also strongly supports the malicious nature of this PDF.

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 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.
  • 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=christmas+carol+songs+english++free In PDF document text
    • https://jajibesuwazigix.weebly.com/uploads/1/3/1/3/131383486/55f0f7f9758.pdfIn PDF document text
    • https://cdn.sqhk.co/zuvezunotumu/ihfhip0/33006044006.pdfIn PDF document text
    • https://pulavirovedozas.weebly.com/uploads/1/3/2/6/132695401/3676499.pdfIn PDF document text
    • https://site-1166084.mozfiles.com/files/1166084/sony_rewards_points_not_showing_up.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/sitok/gevorif.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/kafuwuwafu.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/psp_games_for_free_download_for_sony_psp.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/3600825067.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/14381542251.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/20194061545.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/bollywood_films_box_office_report_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/28034739759.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/fozewu.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/gajilegonifexorelan.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DB 5200 bytes
SHA-256: 6d4c69e691735db488dd0dd2fe99d2de2cdfe83dc88864f3251e9b7aa487556e
font_01_sfnt_off0000da57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA57 10108 bytes
SHA-256: 5d41d0fc6865ef6c7b5c5e1244e8bd42f07c29d4e98fe390531fbad21951f2c4
font_02_sfnt_off0000fd32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD32 16312 bytes
SHA-256: aad9bc0f36eadc3314e08670b59090120051e308b357201f134af3d0b781b2b0

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