Malicious PDF — malware analysis report

Static analysis result for SHA-256 99107ed23970e1c1…

MALICIOUS

PDF

72.4 KB Created: 2020-11-21 01:54:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 48bc57f5054651484a9b440fc4092766 SHA-1: 771d5b47ed810dcb0f500b2e59b17e060db8f996 SHA-256: 99107ed23970e1c1a43d62a1ad1648b222f6a760b0d94b8dc9998a9fe6c1b523
254 Risk Score

Malware Insights

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

The sample is a PDF document that contains embedded links to malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. It also exhibits characteristics of an SEO link farm, with numerous links to external PDFs, likely to improve search engine ranking for malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, and the presence of a password archive lure indicates an attempt to bypass security controls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/123?utm_term=fundamentals+of+thermodynamics+8th+edition+solutions+pdf+free In PDF document text
    • https://dililoperajat.weebly.com/uploads/1/3/4/6/134631443/9594884.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/zirojopemup/50560320610.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b193833d-bd6b-4596-bfd1-dc638311a6dc/51730602098.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/bell_s_palsy_facial_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/23929929331.pdfIn PDF document text
    • https://s3.amazonaws.com/fewifuwu/dragon_city_mod_apkdlmod.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/ordered_probit_model_stata.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/84178124151.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/86063012028.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/86620647419.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/78889504016.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_off0000c3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A7 5648 bytes
SHA-256: b8048577888e6dc08bfe2ba58e8e558a59eb27b9d6034360b7197c7725202352
font_01_sfnt_off0000d6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C0 10128 bytes
SHA-256: 7dd601e5eeafa2edfa29af1dc253e839209337a0668dae88e7bc57906580a131
font_02_sfnt_off0000f9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A5 17660 bytes
SHA-256: ebc785ea83169f785d433e805eca84f7161e14dcf04902825548084fb3ea055c

Open this report in the interactive analyzer, or submit your own file for analysis.