Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdc4413b0b495a51…

MALICIOUS

PDF

27.8 KB Created: 2020-04-19 01:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 37a1d85e26a18d8d0f97510551b4bba3 SHA-1: 740c8176f353ffe3a09af8e51e769b54fd2032b1 SHA-256: cdc4413b0b495a51495cd9218e9154deb86a91297658552d722f50d308172cc0
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a PDF link farm. The primary URL points to a page that appears to be related to web development, but the overall structure suggests a lure. The ML classifier strongly indicated maliciousness. 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://zoomgroom.club/uploads/1/3/1/6/131637027/131637027.html#angular+formgroup+get+validation+errors
    • http://knechtlis.com/uploads/1/3/0/5/130588625/5bfa9826040952.pdf
    • http://it-scc.net/uploads/1/3/0/2/130289585/kuleligas.pdf
    • http://rdavismechanical.net/uploads/1/3/0/5/130590312/desizidafo.pdf
    • http://norasdancewear.com/uploads/1/3/1/4/131453259/xiwejuwuvu_kumetifamaliroj_rewogumasubi.pdf
    • http://aurorakurth.com/uploads/1/3/0/6/130640061/jadawabuwi.pdf
    • http://myidealventures.com/uploads/1/3/1/0/131070767/dewimomigawo.pdf
    • http://responsibleyoungmother.com/uploads/1/3/0/5/130551551/5442002.pdf
    • http://sojocounseling.com/uploads/1/3/0/7/130738565/7256193.pdf
    • http://neindigenousarts.org/uploads/1/3/1/6/131637364/4622223.pdf
    • http://njfamilyphotography.com/uploads/1/3/0/6/130639831/veveje.pdf
    • http://onalltheclouds.com/uploads/1/3/0/3/130313755/6946627.pdf
    • http://ammsdrama.com/uploads/1/3/0/6/130639936/sodejegol.pdf
    • http://napleshomemarket.net/uploads/1/3/0/4/130476262/2831233.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_off000049c7.bin
bdf90614a29e20c7f4208aeeafca76667b20f7af95275eae1c931f00aac6dfc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x49C7 6248 bytes

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