Malicious PDF — malware analysis report

Static analysis result for SHA-256 2da187293d46111e…

MALICIOUS

PDF

44.3 KB Created: 2020-03-21 01:42:57 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3520b21180e118521f3961fa0f1effe7 SHA-1: 3dd3040aaa7b8ee06fb06b2c3a5bfea3d8a2389f SHA-256: 2da187293d46111e71321f8f89b95a2b49a46485ade6e50301661ddf5f1fd3a0
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains, indicating a link farm or SEO poisoning tactic. The document body contains a question about naming ionic compounds, which appears to be a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious. 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://beeseyecandy.com/uploads/1/3/0/3/130312952/130312952.html#name+the+following+ionic+compounds+nabro2
    • http://hostmaster.marthacurtiscoaching.com/uploads/1/3/0/9/130969427/sixutekenu.pdf
    • http://www.spartaunitedtrading.com/uploads/1/3/0/6/130604313/lireliw.pdf
    • http://www.nataliaestradaeditor.com/uploads/1/3/0/9/130969634/mutazoruxivirevab.pdf
    • http://www.lsbol.org/uploads/1/3/0/8/130814553/vixiginumuladij-kivivas-zefuba-bajijaz.pdf
    • http://professionaldocumentpreparations.com/uploads/1/3/0/6/130621155/popeligo.pdf
    • http://lowell-latin-lyceum.org/uploads/1/3/0/3/130313404/ac0b21cd8b599.pdf
    • http://martinvizzina.com/uploads/1/3/0/4/130483349/wamot.pdf
    • http://aomhm.org/uploads/1/3/0/5/130543996/f764183aa971.pdf
    • http://kinoseriya.club/uploads/1/3/0/3/130379175/7405899.pdf
    • http://stmatthewsvoorheesville.net/uploads/1/3/0/5/130550885/80cd441b.pdf
    • http://noisecancelling.net/uploads/1/3/0/2/130270792/lajotoriruber.pdf
    • http://aomhm.org/uploads/1/3/0/5/130543996/f7641
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006bf9.bin
a2295642722084f3b3e0f34bceb7df33222b25519e002a0c19d778c7559f4fed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BF9 8624 bytes
font_01_sfnt_off00008d0f.bin
885781ec91db75dc8c4a6a3d3dac0324bdfdb8f2239dab70466c62035ae072da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D0F 4144 bytes
font_02_sfnt_off00009a08.bin
e2a609504f31aba74360c8f97aead3d8f97c76e888a653261413c8bef59e3205		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A08 2884 bytes

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