Malicious PDF — malware analysis report

Static analysis result for SHA-256 790ad5f66bada92b…

MALICIOUS

PDF

33.3 KB Created: 2020-06-12 00:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 376adc71e71e35e6139d06ac8d521ec5 SHA-1: 1978818d807e3e47fa6a16083bce1fc30db96605 SHA-256: 790ad5f66bada92b02ec488ecb535c6a8f83f7c7cddb33ecc1f01a1b002c2fd0
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file was flagged by a machine learning classifier as malicious. It contains a significant number of external links, a common technique for SEO poisoning or redirecting users to malicious sites. The document body, though heavily obfuscated, contains several URLs that are also present in the list of extracted URLs. No scripts were extracted from this sample, limiting the ability to determine specific payload delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://x0065289xstreamtravel.xsideas.com/uploads/1/3/0/7/130775279/130775279.html#obliques+on+exercise+ball
    • http://ccstripingandsealing.com/uploads/1/3/0/4/130483981/jakakovupu.pdf
    • http://webmail.hairbyjacqueline.com/uploads/1/3/0/5/130590008/9b7aa1.pdf
    • http://kylandarnell.com/uploads/1/3/0/9/130969336/pesarekid_gofumululiw_jubeborivunoka_mexikesebali.pdf
    • https://pobizabaj.files.wordpress.com/2020/06/78476756085.pdf
    • https://zelolasik.files.wordpress.com/2020/06/tunesezenomitowosazu.pdf
    • https://rinuvojoza.files.wordpress.com/2020/06/44678056115.pdf
    • https://tedogodow.files.wordpress.com/2020/06/23353100083.pdf
    • https://lilagelu.files.wordpress.com/2020/06/69113186903.pdf
    • https://jezowiv.files.wordpress.com/2020/06/kuwujuranafokogetemukiwef.pdf
    • https://gozikes.files.wordpress.com/2020/06/16331766475.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000057f9.bin
a00ef9e6f22684c81ef403b42f57edebccfe46563429e514ec247804918915ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57F9 10072 bytes

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