Malicious PDF — malware analysis report

Static analysis result for SHA-256 76de52a5aa8c3a01…

MALICIOUS

PDF

47.6 KB Created: 2020-03-14 18:05:20 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 1bc3f35fd84325f96f4b3530fe1e0624 SHA-1: faa3935339bee7c4434a30eaa118a3c1bec7589c SHA-256: 76de52a5aa8c3a01cc2ac0914b72eac258d5d91f077e6750ed50756dc1b2da65
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files hosted on suspicious domains. The ML classifier strongly flagged this PDF as malicious, and the embedded URLs suggest a link farm or redirection scheme. The document body, though heavily obfuscated, contains references to quote forms and templates, indicating a potential lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://adsl-63-204-18-44.benefitplans.org/uploads/1/3/0/4/130483426/130483426.html#quote+forms+template+excel PDF link annotation
    • http://www.chattanoogasoundmachine.com/uploads/1/3/0/2/130270823/rituzo.pdfIn PDF document text
    • http://hddips.com/uploads/1/3/0/5/130542718/50205e7bc3c81f.pdfIn PDF document text
    • http://mercytrading.net/uploads/1/3/0/4/130475996/3783428.pdfIn PDF document text
    • http://www.metuchendentistry.com/uploads/1/3/0/5/130551604/101988.pdfIn PDF document text
    • http://capermeals.com/uploads/1/3/0/7/130738765/4b366fd39cf.pdfIn PDF document text
    • http://mangosutra.net/uploads/1/3/0/6/130604952/e46aacf5807.pdfIn PDF document text
    • http://mint-uk.com/uploads/1/3/0/7/130776102/4a16f62c4a18d3.pdfIn PDF document text
    • http://razsociety.com/uploads/1/3/0/8/130874509/turisatopo.pdfIn PDF document text
    • http://aetherglow.com/uploads/1/3/0/5/130541803/9334759.pdfIn PDF document text
    • http://www.artportfolioorganizer.com/uploads/1/3/0/6/130639729/bajisopa.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
🗂 Part of campaign: chattanoogasoundmachine.com 3 samples

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DC5 8072 bytes
SHA-256: 965f75b223571d9cbb1a376a990a529bd9a767a15617c382e027c3950c042794
font_01_sfnt_off00009cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9CFE 16036 bytes
SHA-256: 779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63