Malicious PDF — malware analysis report

Static analysis result for SHA-256 2abc3501d13dae20…

MALICIOUS

PDF

40.4 KB Created: 2020-09-30 00:35:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ce4876fc3947ec2e2c310c593b9dcee0 SHA-1: 9dad739bb703f7abf83f13efb41ba731591c120a SHA-256: 2abc3501d13dae20285580261ea1a53168fae00a7c4d2b1fc865bb1a00a7d005
124 Risk Score

Malware Insights

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

This PDF document contains numerous links, including one pointing to known malicious redirector infrastructure. The document body, though partially corrupted, includes text related to merging PDFs and embedded URLs, suggesting a lure to trick users into clicking malicious links. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple links to disposable hosting further supports a malicious intent, likely to redirect users to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://ggtraff.ru/strik?keyword=comment+regrouper+plusieurs+pdf+en+1+seul In PDF document text
    • https://site-1036950.mozfiles.com/files/1036950/10501563271.pdfIn PDF document text
    • https://site-1036995.mozfiles.com/files/1036995/rozenezetatodub.pdfIn PDF document text
    • https://site-1037085.mozfiles.com/files/1037085/65905098750.pdfIn PDF document text
    • https://site-1036876.mozfiles.com/files/1036876/32247792601.pdfIn PDF document text
    • https://site-1037207.mozfiles.com/files/1037207/bafexulivifanevozuson.pdfIn PDF document text
    • https://site-1036909.mozfiles.com/files/1036909/53302794515.pdfIn PDF document text
    • https://site-1037215.mozfiles.com/files/1037215/vepujigigazegetexinaj.pdfIn PDF document text
    • https://site-1036881.mozfiles.com/files/1036881/wudunekur.pdfIn PDF document text
    • https://site-1037890.mozfiles.com/files/1037890/67279418756.pdfIn PDF document text
    • http://rolinipul.sagireconsultingfirm.com/uploads/1/3/1/3/131378776/xewofumudap_mokipape_sedikubod_zunodomafonuso.pdfIn PDF document text
    • http://files.friendsofportlandfire.org/uploads/1/3/1/6/131607440/wonomozujuv.pdfIn PDF document text
    • http://files.therefugevbc.com/uploads/1/3/0/8/130874162/609a12419.pdfIn PDF document text
    • http://files.kennedypickering.com/uploads/1/3/1/6/131636587/vedivevekokiz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00005d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D2D 5108 bytes
SHA-256: 6e599ef602bf4ec22b04b7198b3c78b5f350982c56832f443fa8422d9d38cf20
font_01_sfnt_off00006e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E80 11724 bytes
SHA-256: 005e74076d6276389375c0a5d70452dd622de08cf9e6cb7d493c190d49b9df89

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