Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8575501b5a55777…

MALICIOUS

PDF

39.9 KB Created: 2020-06-03 22:23:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3578b41f2b237bca6d400ebef204a2ec SHA-1: 9e7cb36e9947790611feadf9432de44d0be7528b SHA-256: f8575501b5a55777bc7a5384a5400a38c408f7bf9e897dd9582668cfe45bf35a
94 Risk Score

Malware Insights

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

The PDF document was flagged by an ML classifier as malicious with high confidence. It contains a large number of external links, specifically a link farm, pointing to various domains. The primary purpose appears to be directing users to these external resources, which are likely malicious or used for phishing. No scripts were extracted from this sample.

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://hostmaster.costumeunderground.co.uk/uploads/1/3/0/5/130551559/130551559.html#mireya%2527+s+dance+fit+studio
    • http://siliconlanding.com/uploads/1/3/0/7/130776649/lenipularonojeg.pdf
    • http://guilberoo.com/uploads/1/3/1/3/131381243/zupanoda.pdf
    • http://openmindsoutreach.org/uploads/1/3/0/8/130814631/6323026.pdf
    • http://lasourcedunil.fr/uploads/1/3/0/9/130969381/wifij.pdf
    • http://jimzallar.com/uploads/1/3/0/8/130813819/danevowafu.pdf
    • http://roanokechoristers.com/uploads/1/3/0/6/130604205/2990272.pdf
    • http://mail.graceclt.com/uploads/1/3/0/7/130775422/budolewani.pdf
    • http://cellsitesupport.com/uploads/1/3/1/4/131438848/rubitoparatinu.pdf
    • http://cleanturndr.com/uploads/1/3/1/3/131379189/letubagewino-lutawepurategi-dominix-weweliredime.pdf
    • http://fallingstardusk.com/uploads/1/3/0/3/130324192/woxajarukukowexelup.pdf
    • http://mrmacbiblebook2.com/uploads/1/3/0/5/130544889/tokefimamam_nakesomof_pejatoralab_diwenufu.pdf
    • http://caketherapybakery.com/uploads/1/3/0/6/130621912/3050d65bce.pdf
    • http://hostmaster.costumeunderground.co.uk/uploads/1/3/0/5/130551559/terms.html
    • http://hostmaster.costumeunderground.co.uk/uploads/1/3/0/5/130551559/dmca.html
    • http://hostmaster.costumeunderground.co.uk/uploads/1/3/0/5/130551559/policy.html
    • http://cleanturndr.com/uploads/1/3/1/3/131379189/letu
    • https://fusimutu.files.wordpress.com/2020/06/68484036652.pdf
    • https://susudamasot.files.wordpress.com/2020/06/869274230.pdf
    • https://pidunatuji.files.wordpress.com/2020/06/tenapen.pdf
    • https://wolodexizip.files.wordpress.com/2020/06/livalufasebuxar.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_off00006c89.bin
7d95bb517609b752d814ff4ca0d4a2ca11886f343609c038cc39a610192860f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C89 11380 bytes