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)
MD5: 1bc3f35fd84325f96f4b3530fe1e0624 SHA-1: faa3935339bee7c4434a30eaa118a3c1bec7589c SHA-256: 76de52a5aa8c3a01cc2ac0914b72eac258d5d91f077e6750ed50756dc1b2da65
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The ML classifier strongly identified this PDF as malicious. The document contains a large number of external links, many of which point to suspicious domains structured similarly to SEO link farms. One of the embedded URLs, 'http://adsl-63-204-18-44.benefitplans.org/uploads/1/3/0/4/130483426/130483426.html#quote+forms+template+excel', suggests a lure related to quote forms or templates, likely intended to trick users into clicking through to a malicious site.

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
    • http://www.chattanoogasoundmachine.com/uploads/1/3/0/2/130270823/rituzo.pdf
    • http://hddips.com/uploads/1/3/0/5/130542718/50205e7bc3c81f.pdf
    • http://mercytrading.net/uploads/1/3/0/4/130475996/3783428.pdf
    • http://www.metuchendentistry.com/uploads/1/3/0/5/130551604/101988.pdf
    • http://capermeals.com/uploads/1/3/0/7/130738765/4b366fd39cf.pdf
    • http://mangosutra.net/uploads/1/3/0/6/130604952/e46aacf5807.pdf
    • http://mint-uk.com/uploads/1/3/0/7/130776102/4a16f62c4a18d3.pdf
    • http://razsociety.com/uploads/1/3/0/8/130874509/turisatopo.pdf
    • http://aetherglow.com/uploads/1/3/0/5/130541803/9334759.pdf
    • http://www.artportfolioorganizer.com/uploads/1/3/0/6/130639729/bajisopa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

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

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