Malicious PDF — malware analysis report

Static analysis result for SHA-256 88a6524bc6574fc0…

MALICIOUS

PDF

35.2 KB Created: 2020-06-05 07:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 139001987deaee024854196465c2340c SHA-1: 50df54263ee15f9f00b1e0cda4b96db2bbf3f439 SHA-256: 88a6524bc6574fc0617b26bb40e33ee878e60c492d83a406efd1a83a6d53ffd5
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to suspicious domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm, suggesting a malicious intent to redirect users. The document body, though heavily obfuscated, contains references to URLs that are also present in the extracted URL list, reinforcing the attack pattern of luring users to external sites. No scripts were extracted from this sample.

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://ns1.friendssfpl.org/uploads/1/3/1/8/131871462/131871462.html#reversing+hermon+pdf
    • http://maliyahallen.com/uploads/1/3/0/6/130621359/de3f578cb.pdf
    • http://iris2017.com/uploads/1/3/0/6/130604934/ea7730f4.pdf
    • http://mocexchange.maroevich.com/uploads/1/3/0/2/130289467/riwimababufizogod.pdf
    • http://gailbliss.net/uploads/1/3/0/2/130292089/32a9dfc14195c.pdf
    • http://bassendeangourmetmeats.com/uploads/1/3/0/4/130476917/232922.pdf
    • http://ns1.friendssfpl.org/uploads/1/3/1/8/131871462/terms.html
    • http://ns1.friendssfpl.org/uploads/1/3/1/8/131871462/dmca.html
    • http://ns1.friendssfpl.org/uploads/1/3/1/8/131871462/policy.html
    • https://zemijedo.files.wordpress.com/2020/06/35210200582.pdf
    • https://lavimimirede.files.wordpress.com/2020/06/86443384533.pdf
    • https://ruwufulu.files.wordpress.com/2020/06/79285961483.pdf
    • https://sibegurikure.files.wordpress.com/2020/06/31134564056.pdf
    • https://texizonef523142105.files.wordpress.com/2020/06/xosijulawi.pdf
    • https://nexebobagave.files.wordpress.com/2020/06/nupupomorupubida.pdf
    • https://kelazuwaler.files.wordpress.com/2020/06/pugipa.pdf
    • https://sojowov.files.wordpress.com/2020/06/79505295227.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_off00005f0b.bin
1244c5a4964fddce29f6992a01798a5ea8424f0b7ca827add800b1ec1be8dee5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F0B 10104 bytes

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