Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b66f83aaf32a2b6…

MALICIOUS

PDF

86.6 KB Created: 2021-01-10 02:15:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0f5a1556bc0f3a997e9acc6c7ed09049 SHA-1: 535d27eef362c45603125c06a1fe3c08150ee42e SHA-256: 4b66f83aaf32a2b6443c53b0f86456085c1ea1a05feabbf126007c2a3a31fc26
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting and redirector infrastructure, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity, likely aiming to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://gettraff.ru/aws?utm_term=chobbar+song+whatsapp+status In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387807/normal_5fbc40336e9f4.pdfIn PDF document text
    • https://jarofudi.weebly.com/uploads/1/3/1/4/131408364/gedeboxixirasopasil.pdfIn PDF document text
    • https://subarijarasojud.weebly.com/uploads/1/3/4/3/134332778/8228424.pdfIn PDF document text
    • https://wazemuguv.weebly.com/uploads/1/3/4/4/134489137/36877a31c5.pdfIn PDF document text
    • https://site-1180442.mozfiles.com/files/1180442/loxoda.pdfIn PDF document text
    • https://site-1178347.mozfiles.com/files/1178347/jukirowutinurafap.pdfIn PDF document text
    • https://vujemojijub.weebly.com/uploads/1/3/3/9/133997462/dc59fd336217275.pdfIn PDF document text
    • https://site-1177736.mozfiles.com/files/1177736/17676452418.pdfIn PDF document text
    • https://kajovagej.weebly.com/uploads/1/3/4/7/134747054/kerubak.pdfIn PDF document text
    • https://site-1168136.mozfiles.com/files/1168136/54691318911.pdfIn PDF document text
    • https://jozolarameb.weebly.com/uploads/1/3/4/4/134402644/pumokuzobanuta_jawuradiwidi_wumakijoburoju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452626/normal_5fd8f2f95309e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383928/normal_5f8cb78c91395.pdfIn PDF document text
    • https://site-1178850.mozfiles.com/files/1178850/rifajo.pdfIn PDF document text
    • https://busuguzokiw.weebly.com/uploads/1/3/1/4/131406797/7297488.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454995/normal_5fd1f2e597627.pdfIn PDF document text
    • http://www.opentle.orgIn 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://www.gnu.org/licenses/gpl.htmlIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000eea7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEEA7 12296 bytes
SHA-256: b7144b6757872d846c8e2c529acd3b88cddf07a836f0d2c8b65a1a84e628c12e
font_00_sfnt_off0000dd08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD08 5184 bytes
SHA-256: 32cef7865b529177d68ad99d4ebea31a30476f0293d2ccdbcfef7462851a79c5
font_02_sfnt_off00011224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11224 10464 bytes
SHA-256: 504fc700925a784ff8eb4d119ae6872857d414c2d67f1c8ebfac6bea7705069e
font_03_sfnt_off00013651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13651 16368 bytes
SHA-256: 2c5f51a476b4274b6b900fbba81fc97c04b4f1697b1aac53cf696a9c53e0885f