Malicious PDF — malware analysis report

Static analysis result for SHA-256 0830e07845b06e58…

MALICIOUS

PDF

32.7 KB Created: 2020-05-21 14:23:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6310aa0f4f37df0b4a40833b8a38ac03 SHA-1: 0fc277e352d191e2491bdd95aa6cd1eed96baa51 SHA-256: 0830e07845b06e58f0d731e2df2e63ae68ebdae9d4a53f7af127cd4dc96f88b0
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of external links, many of which point to other PDFs hosted on similar domains, suggesting a link farm designed to host malicious content. The document body includes a prompt to 'Download toronto notes', and one of the extracted URLs is 'http://bedtimenews.net/uploads/1/3/0/6/130639500/130639500.html#download+toronto+notes', indicating a lure for downloading further malicious content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bedtimenews.net/uploads/1/3/0/6/130639500/130639500.html#download+toronto+notes
    • http://deleswaproductions.com/uploads/1/3/0/5/130539450/11c353876e2e75.pdf
    • http://tjmaxxdout.com/uploads/1/3/0/5/130588509/kesata.pdf
    • http://friendsofthejohnsonnaturecenter.org/uploads/1/3/0/4/130476158/mizuwix.pdf
    • http://onemillonreviews.com/uploads/1/3/0/9/130969422/6336317.pdf
    • http://partybusri.com/uploads/1/3/0/3/130313087/voboregabav.pdf
    • http://ninhell.com/uploads/1/3/0/2/130273798/niwusiloza.pdf
    • http://sshvug.com/uploads/1/3/1/1/131164210/690a2a.pdf
    • http://lsa-mi.com/uploads/1/3/0/6/130605406/sasosuv_vifurixaje_sobivizagifux_sizaravuduw.pdf
    • http://noohnaugh.com/uploads/1/3/1/8/131871919/zitivolezodoxiz_derakezukopena.pdf
    • http://zephyrhillfarmvt.com/uploads/1/3/0/7/130775760/rexefabisavigorovutu.pdf
    • http://determinedtolearn.com/uploads/1/3/0/6/130620438/2919c1e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000054cf.bin
f6a95cd4fbbd5f0fd7b029f6d76adabfeda946bbdc99daa1174614f4f9267dec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54CF 10364 bytes

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